31231203102 has 128 divisors (see below), whose sum is σ = 79134451200. Its totient is φ = 9042969600.

The previous prime is 31231203097. The next prime is 31231203119. The reversal of 31231203102 is 20130213213.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1661577 + ... + 1680267.

It is an arithmetic number, because the mean of its divisors is an integer number (618237900).

Almost surely, 2^31231203102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31231203102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39567225600).

31231203102 is an abundant number, since it is smaller than the sum of its proper divisors (47903248098).

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

31231203102 is a wasteful number, since it uses less digits than its factorization.

31231203102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18839 (or 18833 counting only the distinct ones).

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

Adding to 31231203102 its reverse (20130213213), we get a palindrome (51361416315).

The spelling of 31231203102 in words is "thirty-one billion, two hundred thirty-one million, two hundred three thousand, one hundred two".