131807891 has 2 divisors, whose sum is σ = 131807892. Its totient is φ = 131807890.

The previous prime is 131807887. The next prime is 131807909. The reversal of 131807891 is 198708131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131807891 - 2² = 131807887 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (131807861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65903945 + 65903946.

It is an arithmetic number, because the mean of its divisors is an integer number (65903946).

Almost surely, 2^131807891 is an apocalyptic number.

131807891 is a deficient number, since it is larger than the sum of its proper divisors (1).

131807891 is an equidigital number, since it uses as much as digits as its factorization.

131807891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 38.

The square root of 131807891 is about 11480.7617778613. The cubic root of 131807891 is about 508.9172093336.

The spelling of 131807891 in words is "one hundred thirty-one million, eight hundred seven thousand, eight hundred ninety-one".