31686116 has 24 divisors (see below), whose sum is σ = 69134016. Its totient is φ = 12345120.

The previous prime is 31686107. The next prime is 31686139. The reversal of 31686116 is 61168613.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51131 + ... + 51746.

It is an arithmetic number, because the mean of its divisors is an integer number (2880584).

Almost surely, 2^31686116 is an apocalyptic number.

It is an amenable number.

31686116 is an abundant number, since it is smaller than the sum of its proper divisors (37447900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31686116 is a wasteful number, since it uses less digits than its factorization.

31686116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102899 (or 102897 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 31686116 is about 5629.0421920607. The cubic root of 31686116 is about 316.4387565381.

The spelling of 31686116 in words is "thirty-one million, six hundred eighty-six thousand, one hundred sixteen".