31331668 has 12 divisors (see below), whose sum is σ = 55110132. Its totient is φ = 15585920.

The previous prime is 31331659. The next prime is 31331683. The reversal of 31331668 is 86613313.

It can be written as a sum of positive squares in 2 ways, for example, as 17994564 + 13337104 = 4242^2 + 3652^2 .

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 19093 + ... + 20668.

It is an arithmetic number, because the mean of its divisors is an integer number (4592511).

Almost surely, 2^31331668 is an apocalyptic number.

It is an amenable number.

31331668 is a deficient number, since it is larger than the sum of its proper divisors (23778464).

31331668 is a wasteful number, since it uses less digits than its factorization.

31331668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39962 (or 39960 counting only the distinct ones).

The product of its digits is 7776, while the sum is 31.

The square root of 31331668 is about 5597.4697855370. The cubic root of 31331668 is about 315.2544110806.

The spelling of 31331668 in words is "thirty-one million, three hundred thirty-one thousand, six hundred sixty-eight".