31928156161 has 12 divisors (see below), whose sum is σ = 37000106640. Its totient is φ = 27318205760.

The previous prime is 31928156159. The next prime is 31928156167. The reversal of 31928156161 is 16165182913.

It is not a de Polignac number, because 31928156161 - 2¹ = 31928156159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31928156167) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5018551 + ... + 5024908.

It is an arithmetic number, because the mean of its divisors is an integer number (3083342220).

Almost surely, 2^31928156161 is an apocalyptic number.

It is an amenable number.

31928156161 is a deficient number, since it is larger than the sum of its proper divisors (5071950479).

31928156161 is a wasteful number, since it uses less digits than its factorization.

31928156161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10043504 (or 10043487 counting only the distinct ones).

The product of its digits is 77760, while the sum is 43.

The spelling of 31928156161 in words is "thirty-one billion, nine hundred twenty-eight million, one hundred fifty-six thousand, one hundred sixty-one".