31183797172 has 18 divisors (see below), whose sum is σ = 59983709954. Its totient is φ = 14174453040.

The previous prime is 31183797133. The next prime is 31183797217. The reversal of 31183797172 is 27179738113.

It can be written as a sum of positive squares in only one way, i.e., 20682466596 + 10501330576 = 143814^2 + 102476^2 .

It is a congruent 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, 32214183 + ... + 32215150.

Almost surely, 2^31183797172 is an apocalyptic number.

It is an amenable number.

31183797172 is a deficient number, since it is larger than the sum of its proper divisors (28799912782).

31183797172 is a wasteful number, since it uses less digits than its factorization.

31183797172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64429359 (or 64429346 counting only the distinct ones).

The product of its digits is 444528, while the sum is 49.

The spelling of 31183797172 in words is "thirty-one billion, one hundred eighty-three million, seven hundred ninety-seven thousand, one hundred seventy-two".