31120988 has 24 divisors (see below), whose sum is σ = 55319040. Its totient is φ = 15318000.

The previous prime is 31120987. The next prime is 31120997. The reversal of 31120988 is 88902113.

It is a super-2 number, since 2×31120988² = 1937031788192288, which contains 22 as substring.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31120987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123863 + ... + 124113.

It is an arithmetic number, because the mean of its divisors is an integer number (2304960).

Almost surely, 2^31120988 is an apocalyptic number.

It is an amenable number.

31120988 is a deficient number, since it is larger than the sum of its proper divisors (24198052).

31120988 is a wasteful number, since it uses less digits than its factorization.

31120988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617 (or 615 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 31120988 is about 5578.6188254800. The cubic root of 31120988 is about 314.5462114562.

The spelling of 31120988 in words is "thirty-one million, one hundred twenty thousand, nine hundred eighty-eight".