31691683724 has 6 divisors (see below), whose sum is σ = 55460446524. Its totient is φ = 15845841860.

The previous prime is 31691683717. The next prime is 31691683729. The reversal of 31691683724 is 42738619613.

It is not an unprimeable number, because it can be changed into a prime (31691683729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3961460462 + ... + 3961460469.

It is an arithmetic number, because the mean of its divisors is an integer number (9243407754).

Almost surely, 2^31691683724 is an apocalyptic number.

It is an amenable number.

31691683724 is a deficient number, since it is larger than the sum of its proper divisors (23768762800).

31691683724 is a wasteful number, since it uses less digits than its factorization.

31691683724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7922920935 (or 7922920933 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 50.

The spelling of 31691683724 in words is "thirty-one billion, six hundred ninety-one million, six hundred eighty-three thousand, seven hundred twenty-four".