31504172172 has 48 divisors (see below), whose sum is σ = 80217427584. Its totient is φ = 9543744000.

The previous prime is 31504172171. The next prime is 31504172221. The reversal of 31504172172 is 27127140513.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (31504172171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 408147 + ... + 479157.

It is an arithmetic number, because the mean of its divisors is an integer number (1671196408).

Almost surely, 2^31504172172 is an apocalyptic number.

It is an amenable number.

31504172172 is an abundant number, since it is smaller than the sum of its proper divisors (48713255412).

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

31504172172 is a wasteful number, since it uses less digits than its factorization.

31504172172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74390 (or 74388 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 33.

The spelling of 31504172172 in words is "thirty-one billion, five hundred four million, one hundred seventy-two thousand, one hundred seventy-two".