31085916 has 12 divisors (see below), whose sum is σ = 72533832. Its totient is φ = 10361968.

The previous prime is 31085897. The next prime is 31085927. The reversal of 31085916 is 61958013.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1295235 + ... + 1295258.

It is an arithmetic number, because the mean of its divisors is an integer number (6044486).

Almost surely, 2^31085916 is an apocalyptic number.

It is an amenable number.

31085916 is an abundant number, since it is smaller than the sum of its proper divisors (41447916).

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

31085916 is a wasteful number, since it uses less digits than its factorization.

31085916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2590500 (or 2590498 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 31085916 is about 5575.4745089544. The cubic root of 31085916 is about 314.4280070745.

The spelling of 31085916 in words is "thirty-one million, eighty-five thousand, nine hundred sixteen".