131891251 has 2 divisors, whose sum is σ = 131891252. Its totient is φ = 131891250.

The previous prime is 131891239. The next prime is 131891257. The reversal of 131891251 is 152198131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 131891251 - 2⁹ = 131890739 is a prime.

It is not a weakly prime, because it can be changed into another prime (131891257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65945625 + 65945626.

It is an arithmetic number, because the mean of its divisors is an integer number (65945626).

Almost surely, 2^131891251 is an apocalyptic number.

131891251 is a deficient number, since it is larger than the sum of its proper divisors (1).

131891251 is an equidigital number, since it uses as much as digits as its factorization.

131891251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 31.

The square root of 131891251 is about 11484.3916251580. The cubic root of 131891251 is about 509.0244725079.

The spelling of 131891251 in words is "one hundred thirty-one million, eight hundred ninety-one thousand, two hundred fifty-one".