31172515712 has 64 divisors (see below), whose sum is σ = 66910225200. Its totient is φ = 14380498944.

The previous prime is 31172515711. The next prime is 31172515721. The reversal of 31172515712 is 21751527113.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31172515711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5749739 + ... + 5755157.

Almost surely, 2^31172515712 is an apocalyptic number.

31172515712 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31172515712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33455112600).

31172515712 is an abundant number, since it is smaller than the sum of its proper divisors (35737709488).

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

31172515712 is a wasteful number, since it uses less digits than its factorization.

31172515712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8903 (or 8891 counting only the distinct ones).

The product of its digits is 14700, while the sum is 35.

The spelling of 31172515712 in words is "thirty-one billion, one hundred seventy-two million, five hundred fifteen thousand, seven hundred twelve".