31211920568 has 8 divisors (see below), whose sum is σ = 58522351080. Its totient is φ = 15605960280.

The previous prime is 31211920517. The next prime is 31211920601. The reversal of 31211920568 is 86502911213.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1950745028 + ... + 1950745043.

It is an arithmetic number, because the mean of its divisors is an integer number (7315293885).

Almost surely, 2^31211920568 is an apocalyptic number.

It is an amenable number.

31211920568 is a deficient number, since it is larger than the sum of its proper divisors (27310430512).

31211920568 is a wasteful number, since it uses less digits than its factorization.

31211920568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3901490077 (or 3901490073 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 38.

The spelling of 31211920568 in words is "thirty-one billion, two hundred eleven million, nine hundred twenty thousand, five hundred sixty-eight".