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Cardinal | ninety-one | |||
Ordinal | 91st (ninety-first) | |||
Factorization | 7 × 13 | |||
Divisors | 1, 7, 13, 91 | |||
Greek numeral | ϞΑ´ | |||
Roman numeral | XCI | |||
Binary | 10110112 | |||
Ternary | 101013 | |||
Senary | 2316 | |||
Octal | 1338 | |||
Duodecimal | 7712 | |||
Hexadecimal | 5B16 |
91 (ninety-one) is the natural number following 90 and preceding 92.
91 is:
The decimal equivalent of the fraction 1⁄91 can be obtained by using powers of 9.
Ninety-one is also:
10 (ten) is the even natural number following 9 and preceding 11. Ten is the base of the decimal numeral system, the most common system of denoting numbers in both spoken and written language.
21 (twenty-one) is the natural number following 20 and preceding 22.
35 (thirty-five) is the natural number following 34 and preceding 36.
46 (forty-six) is the natural number following 45 and preceding 47.
55 (fifty-five) is the natural number following 54 and preceding 56.
58 (fifty-eight) is the natural number following 57 and preceding 59.
64 (sixty-four) is the natural number following 63 and preceding 65.
1000 or one thousand is the natural number following 999 and preceding 1001. In most English-speaking countries, it can be written with or without a comma or sometimes a period separating the thousands digit: 1,000.
300 is the natural number following 299 and preceding 301.
190 is the natural number following 189 and preceding 191.
500 is the natural number following 499 and preceding 501.
700 is the natural number following 699 and preceding 701.
600 is the natural number following 599 and preceding 601.
800 is the natural number following 799 and preceding 801.
4000 is the natural number following 3999 and preceding 4001. It is a decagonal number.
8000 is the natural number following 7999 and preceding 8001.
216 is the natural number following 215 and preceding 217. It is a cube, and is often called Plato's number, although it is not certain that this is the number intended by Plato.
177 is the natural number following 176 and preceding 178.
30,000 is the natural number that comes after 29,999 and before 30,001.