31991068 has 12 divisors (see below), whose sum is σ = 58418640. Its totient is φ = 15300032.

The previous prime is 31991053. The next prime is 31991087. The reversal of 31991068 is 86019913.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173773 + ... + 173956.

It is an arithmetic number, because the mean of its divisors is an integer number (4868220).

Almost surely, 2^31991068 is an apocalyptic number.

It is an amenable number.

31991068 is a deficient number, since it is larger than the sum of its proper divisors (26427572).

31991068 is a wasteful number, since it uses less digits than its factorization.

31991068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347756 (or 347754 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 31991068 is about 5656.0647096723. The cubic root of 31991068 is about 317.4506687570.

The spelling of 31991068 in words is "thirty-one million, nine hundred ninety-one thousand, sixty-eight".