31102013232 has 120 divisors (see below), whose sum is σ = 90388496016. Its totient is φ = 10353298176.

The previous prime is 31102013231. The next prime is 31102013237. The reversal of 31102013232 is 23231020113.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (31102013231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3093718 + ... + 3103754.

Almost surely, 2^31102013232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31102013232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45194248008).

31102013232 is an abundant number, since it is smaller than the sum of its proper divisors (59286482784).

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

31102013232 is a wasteful number, since it uses less digits than its factorization.

31102013232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10857 (or 10839 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31102013232 its reverse (23231020113), we get a palindrome (54333033345).

The spelling of 31102013232 in words is "thirty-one billion, one hundred two million, thirteen thousand, two hundred thirty-two".