31912727172 has 48 divisors (see below), whose sum is σ = 79515609600. Its totient is φ = 9939444480.

The previous prime is 31912727113. The next prime is 31912727177. The reversal of 31912727172 is 27172721913.

It is not an unprimeable number, because it can be changed into a prime (31912727177) 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, 1468297 + ... + 1489872.

It is an arithmetic number, because the mean of its divisors is an integer number (1656575200).

Almost surely, 2^31912727172 is an apocalyptic number.

It is an amenable number.

31912727172 is an abundant number, since it is smaller than the sum of its proper divisors (47602882428).

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

31912727172 is a wasteful number, since it uses less digits than its factorization.

31912727172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2958236 (or 2958234 counting only the distinct ones).

The product of its digits is 74088, while the sum is 42.

The spelling of 31912727172 in words is "thirty-one billion, nine hundred twelve million, seven hundred twenty-seven thousand, one hundred seventy-two".