31138056 has 48 divisors (see below), whose sum is σ = 84717360. Its totient is φ = 10332000.

The previous prime is 31138039. The next prime is 31138057. The reversal of 31138056 is 65083113.

It is not an unprimeable number, because it can be changed into a prime (31138057) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17211 + ... + 18933.

It is an arithmetic number, because the mean of its divisors is an integer number (1764945).

Almost surely, 2^31138056 is an apocalyptic number.

31138056 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

31138056 is an abundant number, since it is smaller than the sum of its proper divisors (53579304).

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

31138056 is a wasteful number, since it uses less digits than its factorization.

31138056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1986 (or 1979 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 31138056 is about 5580.1483851238. The cubic root of 31138056 is about 314.6037042064.

The spelling of 31138056 in words is "thirty-one million, one hundred thirty-eight thousand, fifty-six".