31290912 has 36 divisors (see below), whose sum is σ = 88984350. Its totient is φ = 10430208.

The previous prime is 31290893. The next prime is 31290949. The reversal of 31290912 is 21909213.

It can be written as a sum of positive squares in only one way, i.e., 26255376 + 5035536 = 5124^2 + 2244^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 5 ways as a sum of consecutive naturals, for example, 54037 + ... + 54612.

Almost surely, 2^31290912 is an apocalyptic number.

31290912 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31290912 is an abundant number, since it is smaller than the sum of its proper divisors (57693438).

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

31290912 is a wasteful number, since it uses less digits than its factorization.

31290912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108665 (or 108654 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 31290912 is about 5593.8280273888. The cubic root of 31290912 is about 315.1176582390.

The spelling of 31290912 in words is "thirty-one million, two hundred ninety thousand, nine hundred twelve".