31338688172 has 12 divisors (see below), whose sum is σ = 59828404776. Its totient is φ = 14244858240.

The previous prime is 31338688169. The next prime is 31338688181. The reversal of 31338688172 is 27188683313.

It is a happy number.

It is a super-2 number, since 2×31338688172² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31338688172.

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, 356121413 + ... + 356121500.

It is an arithmetic number, because the mean of its divisors is an integer number (4985700398).

Almost surely, 2^31338688172 is an apocalyptic number.

It is an amenable number.

31338688172 is a deficient number, since it is larger than the sum of its proper divisors (28489716604).

31338688172 is a wasteful number, since it uses less digits than its factorization.

31338688172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712242928 (or 712242926 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 50.

The spelling of 31338688172 in words is "thirty-one billion, three hundred thirty-eight million, six hundred eighty-eight thousand, one hundred seventy-two".