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Cardinal | one hundred thirty-one | |||
Ordinal | 131st (one hundred and thirty-first) |
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Factorization | prime | |||
Prime | 32nd | |||
Divisors | 1, 131 | |||
Roman numeral | CXXXI | |||
Binary | 100000112 | |||
Ternary | 112123 | |||
Quaternary | 20034 | |||
Quinary | 10115 | |||
Senary | 3356 | |||
Octal | 2038 | |||
Duodecimal | AB12 | |||
Hexadecimal | 8316 | |||
Vigesimal | 6B20 | |||
Base 36 | 3N36 |
131 (one hundred [and] thirty-one) is the natural number following 130 and preceding 132.
131 is a Sophie Germain prime, an irregular prime, the second 3-digit palindromic prime, and also a permutable prime with 113 and 311. It can be expressed as the sum of three consecutive primes, 131 = 41 + 43 + 47. 131 is an Eisenstein prime with no imaginary part and real part of the form . Because the next odd number, 133, is a semiprime, 131 is a Chen prime. 131 is an Ulam number.
131 is a full reptend prime in base 10 (and also in base 2). The decimal expansion of 1/131 repeats the digits 007633587786259541984732824427480916030534351145038167938931 297709923664122137404580152671755725190839694656488549618320 6106870229 indefinitely.
131 is also: