31156996 has 48 divisors (see below), whose sum is σ = 62092800. Its totient is φ = 13571712.

The previous prime is 31156987. The next prime is 31157003. The reversal of 31156996 is 69965113.

It is a super-3 number, since 3×31156996³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130245 + ... + 130483.

It is an arithmetic number, because the mean of its divisors is an integer number (1293600).

Almost surely, 2^31156996 is an apocalyptic number.

It is an amenable number.

31156996 is a deficient number, since it is larger than the sum of its proper divisors (30935804).

31156996 is a wasteful number, since it uses less digits than its factorization.

31156996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388 (or 386 counting only the distinct ones).

The product of its digits is 43740, while the sum is 40.

The square root of 31156996 is about 5581.8452146221. The cubic root of 31156996 is about 314.6674781132.

The spelling of 31156996 in words is "thirty-one million, one hundred fifty-six thousand, nine hundred ninety-six".