31916 has 12 divisors (see below), whose sum is σ = 57120. Its totient is φ = 15600.

The previous prime is 31907. The next prime is 31957. The reversal of 31916 is 61913.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

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, 266 + ... + 366.

It is an arithmetic number, because the mean of its divisors is an integer number (4760).

2³¹⁹¹⁶ is an apocalyptic number.

It is an amenable number.

31916 is a deficient number, since it is larger than the sum of its proper divisors (25204).

31916 is a wasteful number, since it uses less digits than its factorization.

31916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184 (or 182 counting only the distinct ones).

The product of its digits is 162, while the sum is 20.

The square root of 31916 is about 178.6504967807. The cubic root of 31916 is about 31.7202171784.

The spelling of 31916 in words is "thirty-one thousand, nine hundred sixteen".