31231855272 has 16 divisors (see below), whose sum is σ = 78079638240. Its totient is φ = 10410618416.

The previous prime is 31231855253. The next prime is 31231855301. The reversal of 31231855272 is 27255813213.

It is a self number, because there is not a number n which added to its sum of digits gives 31231855272.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 650663628 + ... + 650663675.

It is an arithmetic number, because the mean of its divisors is an integer number (4879977390).

Almost surely, 2^31231855272 is an apocalyptic number.

It is an amenable number.

31231855272 is an abundant number, since it is smaller than the sum of its proper divisors (46847782968).

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

31231855272 is a wasteful number, since it uses less digits than its factorization.

31231855272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301327312 (or 1301327308 counting only the distinct ones).

The product of its digits is 100800, while the sum is 39.

The spelling of 31231855272 in words is "thirty-one billion, two hundred thirty-one million, eight hundred fifty-five thousand, two hundred seventy-two".