31776906161 has 48 divisors (see below), whose sum is σ = 43635227328. Its totient is φ = 22747132800.

The previous prime is 31776906149. The next prime is 31776906169. The reversal of 31776906161 is 16160967713.

It is not a de Polignac number, because 31776906161 - 2¹⁰ = 31776905137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31776906169) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1467731 + ... + 1489223.

It is an arithmetic number, because the mean of its divisors is an integer number (909067236).

Almost surely, 2^31776906161 is an apocalyptic number.

It is an amenable number.

31776906161 is a deficient number, since it is larger than the sum of its proper divisors (11858321167).

31776906161 is a wasteful number, since it uses less digits than its factorization.

31776906161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21742 (or 21735 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 47.

The spelling of 31776906161 in words is "thirty-one billion, seven hundred seventy-six million, nine hundred six thousand, one hundred sixty-one".