31691357392 has 30 divisors (see below), whose sum is σ = 64187746322. Its totient is φ = 15156732096.

The previous prime is 31691357377. The next prime is 31691357419. The reversal of 31691357392 is 29375319613.

It can be written as a sum of positive squares in only one way, i.e., 16898960016 + 14792397376 = 129996^2 + 121624^2 .

It is a congruent number.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 1863663 + ... + 1880590.

Almost surely, 2^31691357392 is an apocalyptic number.

It is an amenable number.

31691357392 is an abundant number, since it is smaller than the sum of its proper divisors (32496388930).

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

31691357392 is a wasteful number, since it uses less digits than its factorization.

31691357392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3744307 (or 3744278 counting only the distinct ones).

The product of its digits is 918540, while the sum is 49.

The spelling of 31691357392 in words is "thirty-one billion, six hundred ninety-one million, three hundred fifty-seven thousand, three hundred ninety-two".