131397957 has 20 divisors (see below), whose sum is σ = 196747936. Its totient is φ = 87392520.

The previous prime is 131397953. The next prime is 131397961. The reversal of 131397957 is 759793131.

It is an interprime number because it is at equal distance from previous prime (131397953) and next prime (131397961).

It is not a de Polignac number, because 131397957 - 2² = 131397953 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131397953) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 37782 + ... + 41112.

Almost surely, 2^131397957 is an apocalyptic number.

It is an amenable number.

131397957 is a deficient number, since it is larger than the sum of its proper divisors (65349979).

131397957 is an equidigital number, since it uses as much as digits as its factorization.

131397957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3830 (or 3821 counting only the distinct ones).

The product of its digits is 178605, while the sum is 45.

The square root of 131397957 is about 11462.8947914565. The cubic root of 131397957 is about 508.3890691791.

The spelling of 131397957 in words is "one hundred thirty-one million, three hundred ninety-seven thousand, nine hundred fifty-seven".