31173189138 has 48 divisors (see below), whose sum is σ = 83128508736. Its totient is φ = 8221500000.

The previous prime is 31173189079. The next prime is 31173189143. The reversal of 31173189138 is 83198137113.

31173189138 is a `hidden beast` number, since 311 + 7 + 318 + 9 + 13 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 31173189093 and 31173189102.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9513988 + ... + 9517263.

It is an arithmetic number, because the mean of its divisors is an integer number (1731843932).

Almost surely, 2^31173189138 is an apocalyptic number.

31173189138 is an abundant number, since it is smaller than the sum of its proper divisors (51955319598).

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

31173189138 is a wasteful number, since it uses less digits than its factorization.

31173189138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19031279 (or 19031276 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The spelling of 31173189138 in words is "thirty-one billion, one hundred seventy-three million, one hundred eighty-nine thousand, one hundred thirty-eight".