31355618812 has 18 divisors (see below), whose sum is σ = 63831081552. Its totient is φ = 13438122264.

The previous prime is 31355618807. The next prime is 31355618867. The reversal of 31355618812 is 21881655313.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 79988628 + ... + 79989019.

Almost surely, 2^31355618812 is an apocalyptic number.

It is an amenable number.

31355618812 is an abundant number, since it is smaller than the sum of its proper divisors (32475462740).

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

31355618812 is a wasteful number, since it uses less digits than its factorization.

31355618812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159977665 (or 159977656 counting only the distinct ones).

The product of its digits is 172800, while the sum is 43.

The spelling of 31355618812 in words is "thirty-one billion, three hundred fifty-five million, six hundred eighteen thousand, eight hundred twelve".