31138156 has 12 divisors (see below), whose sum is σ = 62276368. Its totient is φ = 13344912.

The previous prime is 31138153. The next prime is 31138181. The reversal of 31138156 is 65183113.

31138156 is an admirable number.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 1112077 = 31138156 / (3 + 1 + 1 + 3 + 8 + 1 + 5 + 6).

It is not an unprimeable number, because it can be changed into a prime (31138153) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 556011 + ... + 556066.

Almost surely, 2^31138156 is an apocalyptic number.

It is an amenable number.

31138156 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

31138156 is a wasteful number, since it uses less digits than its factorization.

31138156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112088 (or 1112086 counting only the distinct ones).

The product of its digits is 2160, while the sum is 28.

The square root of 31138156 is about 5580.1573454518. The cubic root of 31138156 is about 314.6040409898.

The spelling of 31138156 in words is "thirty-one million, one hundred thirty-eight thousand, one hundred fifty-six".