3172131312218 has 12 divisors (see below), whose sum is σ = 5230084271370. Its totient is φ = 1441877869080.

The previous prime is 3172131312173. The next prime is 3172131312221. The reversal of 3172131312218 is 8122131312713.

It can be written as a sum of positive squares in only one way, i.e., 2694729082969 + 477402229249 = 1641563^2 + 690943^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6553990073 + ... + 6553990556.

Almost surely, 2^{3172131312218} is an apocalyptic number.

3172131312218 is a deficient number, since it is larger than the sum of its proper divisors (2057952959152).

3172131312218 is a wasteful number, since it uses less digits than its factorization.

3172131312218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13107980653 (or 13107980642 counting only the distinct ones).

The product of its digits is 12096, while the sum is 35.

The spelling of 3172131312218 in words is "three trillion, one hundred seventy-two billion, one hundred thirty-one million, three hundred twelve thousand, two hundred eighteen".