31686957 has 12 divisors (see below), whose sum is σ = 47465600. Its totient is φ = 21124476.

The previous prime is 31686947. The next prime is 31686983. The reversal of 31686957 is 75968613.

It is a happy number.

It is not a de Polignac number, because 31686957 - 2⁸ = 31686701 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31686917) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64957 + ... + 65442.

Almost surely, 2^31686957 is an apocalyptic number.

It is an amenable number.

31686957 is a deficient number, since it is larger than the sum of its proper divisors (15778643).

31686957 is an equidigital number, since it uses as much as digits as its factorization.

31686957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130414 (or 130402 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 31686957 is about 5629.1168934390. The cubic root of 31686957 is about 316.4415561096.

The spelling of 31686957 in words is "thirty-one million, six hundred eighty-six thousand, nine hundred fifty-seven".