31161317656 has 64 divisors (see below), whose sum is σ = 67226664960. Its totient is φ = 13264560000.

The previous prime is 31161317647. The next prime is 31161317657. The reversal of 31161317656 is 65671316113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31161317657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11665201 + ... + 11667871.

It is an arithmetic number, because the mean of its divisors is an integer number (1050416640).

Almost surely, 2^31161317656 is an apocalyptic number.

It is an amenable number.

31161317656 is an abundant number, since it is smaller than the sum of its proper divisors (36065347304).

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

31161317656 is a wasteful number, since it uses less digits than its factorization.

31161317656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4016 (or 4012 counting only the distinct ones).

The product of its digits is 68040, while the sum is 40.

The spelling of 31161317656 in words is "thirty-one billion, one hundred sixty-one million, three hundred seventeen thousand, six hundred fifty-six".