31102012032 has 128 divisors (see below), whose sum is σ = 101679768960. Its totient is φ = 8202719232.

The previous prime is 31102012027. The next prime is 31102012033. The reversal of 31102012032 is 23021020113.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (31102012033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 410083 + ... + 479970.

It is an arithmetic number, because the mean of its divisors is an integer number (794373195).

Almost surely, 2^31102012032 is an apocalyptic number.

31102012032 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31102012032 is an abundant number, since it is smaller than the sum of its proper divisors (70577756928).

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

31102012032 is a wasteful number, since it uses less digits than its factorization.

31102012032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890090 (or 890078 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 31102012032 its reverse (23021020113), we get a palindrome (54123032145).

The spelling of 31102012032 in words is "thirty-one billion, one hundred two million, twelve thousand, thirty-two".