1000000000
| 1000000000 | |
|---|---|
| Cardinal | One billion (short scale) One thousand million, or one milliard (long scale) |
| Ordinal | One billionth (short scale) |
| Factorization | 29 · 59 |
| Roman numeral | M |
| Binary | 1110111001101011001010000000002 |
| Ternary | 21202002000210100013 |
| Quaternary | 3232122302200004 |
| Quinary | 40220000000005 |
| Senary | 2431212453446 |
| Octal | 73465450008 |
| Duodecimal | 23AA9385412 |
| Hexadecimal | 3B9ACA0016 |
| Vigesimal | FCA000020 |
| Base 36 | GJDGXS36 |
1,000,000,000 (one billion, short scale; one thousand million or milliard, yard, 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.
In scientific notation, it is written as 1 × 109. The SI prefix giga indicates 1,000,000,000 times the base unit.
One billion years may be called eon (or 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 as common as earlier, and the word has been used to mean one thousand million (1,000,000,000) for some time. The alternative term "one thousand million" is mainly used in the U.K., or countries such as Spain that uses "one thousand million" as one million million constitutes a billion. The worded figure, as opposed to the numerical figure (one thousand million/1,000,000,000) is used to differentiate between "one thousand million" or "one billion".
The term milliard can also be used to refer to 1,000,000,000; whereas "milliard" is seldom used in English, variations on this name often appear in .
In the South Asian numbering system, it is known as 100 crore or 1 Arab.
The facts below give a sense of how large 1,000,000,000 (109) is in the context of time according to current scientific evidence:
A is a cube; B consists of 1000 cubes of type A, C consists of 1000 Bs; and D consists of 1000 Cs. Thus there are 1 million As in C; and 1,000,000,000 As in D.
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