1,000,000,000
1000000000  



Cardinal  One billion (short scale) One thousand million, or one milliard (long scale) 
Ordinal  One billionth (short scale) 
Factorization  2^{9} · 5^{9} 
Greek numeral  ${\stackrel {\iota }{\mathrm {M} }}$ 
Roman numeral  M 
Binary  111011100110101100101000000000_{2} 
Ternary  2120200200021010001_{3} 
Quaternary  323212230220000_{4} 
Quinary  4022000000000_{5} 
Senary  243121245344_{6} 
Octal  7346545000_{8} 
Duodecimal  23AA93854_{12} 
Hexadecimal  3B9ACA00_{16} 
Vigesimal  FCA0000_{20} 
Base 36  GJDGXS_{36} 
1,000,000,000 (one billion, short scale; one thousand million or milliard, yard,^{[1]} long scale) is the natural number following 999,999,999 and preceding 1,000,000,001. One billion can also be written as b or bn.^{[2]}^{[3]}
In scientific notation, it is written as 1 × 10^{9}. The metric prefix giga indicates 1,000,000,000 times the base unit. Its symbol is G.
One billion years may be called eon/aeon in astronomy or geology.
Previously in British English (but not in American English), the word "billion" referred exclusively to a million millions (1,000,000,000,000). However, this is no longer common, and the word has been used to mean one thousand million (1,000,000,000) for several decades.^{[4]}
The term milliard can also be used to refer to 1,000,000,000; whereas "milliard" is rarely used in English,^{[5]} variations on this name often appear in other languages.
In the South Asian numbering system, it is known as 100 crore or 1 arab.
Sense of scale
The facts below give a sense of how large 1,000,000,000 (10^{9}) is in the context of time according to current scientific evidence:
Time
 10^{9} seconds (1 gigasecond) is approximately 31.7 years
 About 10^{9} minutes ago, the Roman Empire was flourishing and Christianity was emerging. (10^{9} minutes is roughly 1,901 years.)
 About 10^{9} hours ago, modern human beings and their ancestors were living in the Stone Age (more precisely, the Middle Paleolithic). (10^{9} hours is roughly 114,080 years.)
 About 10^{9} days ago, Australopithecus, an apelike creature related to an ancestor of modern humans, roamed the African savannas. (10^{9} days is roughly 2.738 million years.)
 About 10^{9} months ago, dinosaurs walked the Earth during the late Cretaceous. (10^{9} months is roughly 83.3 million years.)
 About 10^{9} years—a gigaannus—ago, the first multicellular eukaryotes appeared on Earth.
 About 10^{9} decades ago, galaxies began to appear in the early Universe which was then 3.799 billion years old. (10^{9} decades is exactly 10 billion years.)
 The universe is thought to be about 13.8 × 10^{9} years old.^{[6]}
Distance
 10^{9} inches is 15,783 miles (25,400 km), more than halfway around the world and thus sufficient to reach any point on the globe from any other point.
 10^{9} metres (called a gigametre) is almost three times the distance from the Earth to the Moon.
 10^{9} kilometres (called a terameter) is over six times the distance from the Earth to the Sun.
Area
 A billion square inches would be a square about one half mile on a side.
 A piece of finely woven bed sheet cloth that contained a billion holes would measure about 500 square feet (46 m^{2}), large enough to cover a moderate sized apartment.
Volume
 There are a billion cubic millimetres in a cubic metre and there are a billion cubic metres in a cubic kilometre.
 A billion grains of table salt or granulated sugar would occupy a volume of about 2.5 cubic feet (0.071 m^{3}).
 A billion cubic inches would be a volume comparable to a large commercial building slightly larger than a typical supermarket.
Weight
 Any object that weighs one billion kilograms (2.2×10^{9} lb) would weigh about as much as 5,525 empty Boeing 747400s.
 A cube of iron that weighs one billion pounds (450,000,000 kg) would be 1,521 feet 4 inches (0.28813 mi; 463.70 m) on each side.
Products
 As of July 2016, Apple has sold one billion iPhones.^{[7]} This makes the iPhone one of the most successful product lines in history, surpassing the PlayStation and the Rubik's Cube.
 As of July 2016, Facebook has 1.71 billion users.^{[8]}
Nature
 A small mountain, slightly larger than Stone Mountain in Georgia, United States, would weigh (have a mass of) a billion tons.
 There are billions of worker ants in the largest ant colony in the world,^{[9]} which covers almost 4,000 miles (6,400 km) of the Mediterranean coast.
 In 1804, the world population was one billion.
Count
A is a cube; B consists of 1000 cubes the size of cube A, C consists of 1000 cubes the size of cube B; and D consists of 1000 cubes the size of cube C. Thus there are 1 million Asized cubes in C; and 1,000,000,000 Asized cubes in D.
Selected 10digit numbers (1,000,000,001–9,999,999,999)
1,000,000,001 to 1,999,999,999
 1,000,000,007 – smallest prime number with 10 digits.^{[10]}
 1,000,014,129 – smallest tendigit square.
 1,023,456,789 – smallest pandigital number in base 10.
 1,026,753,849 – smallest pandigital square that includes 0.
 1,073,676,287 – 15th Carol number.^{[11]}
 1,073,741,824 – 2^{30}
 1,073,807,359 – 14th Kynea number.^{[12]}
 1,111,111,111 – repunit, also a special number relating to the passing of Unix time.
 1,129,760,415 – 23rd Motzkin number.^{[13]}
 1,134,903,170 – 45th Fibonacci number.
 1,162,261,467 – 3^{19}
 1,220,703,125 – 5^{13}
 1,232,922,769 – Centered hexagonal number.
 1,280,000,000 – 20^{7}
 1,234,567,890 – pandigital number with the digits in order.
 1,311,738,121 – 25th Pell number.^{[14]}
 1,382,958,545 – 15th Bell number.^{[15]}
 1,406,818,759 – 30th Wedderburn–Etherington number.^{[16]}
 1,475,789,056 – 14^{8}
 1,631,432,881 – Triangular square number.
 1,673,196,525 – Lowest common multiple of the odd integers from 1 to 25
 1,787,109,376 – 1automorphic number^{[17]}
 1,836,311,903 – 46th Fibonacci number.
 1,882,341,361 – The smallest prime whose reversal is both square (40391^{2}) and triangular (triangular of 57121).
 1,977,326,743 – 7^{11}
2,000,000,000 to 2,999,999,999
 2,038,074,743 – 100,000,000th prime number
 2,147,483,647 – 8th Mersenne prime and the largest signed 32bit integer.
 2,147,483,648 – 2^{31}
 2,176,782,336 – 6^{12}
 2,214,502,422 – 6th primary pseudoperfect number.^{[18]}
 2,357,947,691 – 11^{9}
 2,562,890,625 – 15^{8}
 2,971,215,073 – 11th Fibonacci prime (47th Fibonacci number).
3,000,000,000 to 3,999,999,999
 3,166,815,962 – 26th Pell number.^{[14]}
 3,192,727,797 – 24th Motzkin number.^{[13]}
 3,323,236,238 – 31st Wedderburn–Etherington number.^{[16]}
 3,405,691,582 – hexadecimal CAFEBABE; used as a placeholder in programming.
 3,405,697,037 – hexadecimal CAFED00D; used as a placeholder in programming.
 3,486,784,401 – 3^{20}
 3,735,928,559 – hexadecimal DEADBEEF; used as a placeholder in programming.
4,000,000,000 to 4,999,999,999
 4,294,836,223 – 16th Carol number.^{[11]}
 4,294,967,291 – Largest prime 32bit unsigned integer.
 4,294,967,295 – Maximum 32bit unsigned integer (FFFFFFFF_{16}), perfect totient number, product of the five prime Fermat numbers through .
 4,294,967,296 – 2^{32}
 4,294,967,297 – , the first composite Fermat number.
 4,295,098,367 – 15th Kynea number.^{[12]}
 4,807,526,976 – 48th Fibonacci number.
5,000,000,000 to 5,999,999,999
 5,159,780,352 – 12^{9}
 5,354,228,880 – superior highly composite number, smallest number divisible by all the numbers 1 through 24
 5,784,634,181 – 13th alternating factorial.^{[19]}
6,000,000,000 to 6,999,999,999
 6,103,515,625 – 5^{14}
 6,210,001,000 – only selfdescriptive number in base 10.
 6,227,020,800 – 13!
 6,975,757,441 – 17^{8}
 6,983,776,800 – 15th colossally abundant number,^{[20]} 15th superior highly composite number^{[21]}
7,000,000,000 to 7,999,999,999
 7,645,370,045 – 27th Pell number.^{[14]}
 7,778,742,049 – 49th Fibonacci number.
 7,862,958,391 – 32nd Wedderburn–Etherington number.^{[16]}
8,000,000,000 to 8,999,999,999
 8,212,890,625 – 1automorphic number^{[17]}
 8,589,869,056 – 6th perfect number.^{[22]}
 8,589,934,592 – 2^{33}
9,000,000,000 to 9,999,999,999
 9,043,402,501 – 25th Motzkin number.^{[13]}
 9,814,072,356 – largest square pandigital number, largest pandigital pure power.
 9,876,543,210 – largest number without redundant digits.
 9,999,999,967 – greatest prime number with ten digits.^{[23]}
References
 ^ "Yard". Investopedia. Retrieved 13 November 2017.
 ^ "figures". The Economist Style Guide (11th ed.). The Economist. 2015.
 ^ "6.5 Abbreviating 'million' and 'billion'". English Style Guide: A handbook for authors and translators in the European Commission (PDF) (8th ed.). European Commission. 3 November 2017. p. 32.
 ^ "How many is a billion?". OxfordDictionaries.com. Retrieved 13 November 2017.
 ^ "billion,thousand million,milliard". Google Ngram Viewer. Retrieved 13 November 2017.
 ^ "Cosmic Detectives". European Space Agency. 2 April 2013.
 ^ Panken, Eli (27 July 2016). "Apple Announces It Has Sold One Billion iPhones". NBCNews.com. Retrieved 13 November 2017.
 ^ Seethamaram, Deep (27 July 2016). "Facebook Posts Strong Profit and Revenue Growth". The Wall Street Journal. Retrieved 13 November 2017.
 ^ Burke, Jeremy (16 June 2015). "How the World Became A Giant Ant Colony". Atlas Obscura. Retrieved 13 November 2017.
 ^ Sloane, N. J. A. (ed.). "Sequence A003617 (Smallest ndigit prime)". The OnLine Encyclopedia of Integer Sequences. OEIS Foundation.
 ^ ^{a} ^{b} Sloane, N. J. A. (ed.). "Sequence A093112 (a(n) = (2^n1)^2  2)". The OnLine Encyclopedia of Integer Sequences. OEIS Foundation.
 ^ ^{a} ^{b} Sloane, N. J. A. (ed.). "Sequence A093069 (a(n) = (2^n + 1)^2 )". The OnLine Encyclopedia of Integer Sequences. OEIS Foundation.
 ^ ^{a} ^{b} ^{c} Sloane, N. J. A. (ed.). "Sequence A001006 (Motzkin numbers)". The OnLine Encyclopedia of Integer Sequences. OEIS Foundation.
 ^ ^{a} ^{b} ^{c} Sloane, N. J. A. (ed.). "Sequence A000129 (Pell numbers)". The OnLine Encyclopedia of Integer Sequences. OEIS Foundation.
 ^ Sloane, N. J. A. (ed.). "Sequence A000110 (Bell or exponential numbers)". The OnLine Encyclopedia of Integer Sequences. OEIS Foundation.
 ^ ^{a} ^{b} ^{c} Sloane, N. J. A. (ed.). "Sequence A001190 (WedderburnEtherington numbers)". The OnLine Encyclopedia of Integer Sequences. OEIS Foundation.
 ^ ^{a} ^{b} Sloane, N. J. A. (ed.). "Sequence A003226 (Automorphic numbers)". The OnLine Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 20190406.
 ^ Sloane, N. J. A. (ed.). "Sequence A054377 (Primary pseudoperfect numbers)". The OnLine Encyclopedia of Integer Sequences. OEIS Foundation.
 ^ Sloane, N. J. A. (ed.). "Sequence A005165 (Alternating factorials)". The OnLine Encyclopedia of Integer Sequences. OEIS Foundation.
 ^ Sloane, N. J. A. (ed.). "Sequence A004490 (Colossally abundant numbers)". The OnLine Encyclopedia of Integer Sequences. OEIS Foundation.
 ^ Sloane, N. J. A. (ed.). "Sequence A002201 (Superior highly composite numbers)". The OnLine Encyclopedia of Integer Sequences. OEIS Foundation.
 ^ Sloane, N. J. A. (ed.). "Sequence A000396 (Perfect numbers)". The OnLine Encyclopedia of Integer Sequences. OEIS Foundation.
 ^ "Greatest prime number with 10 digits". Wolfram Alpha. Retrieved 13 November 2017.
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