31231311320 has 64 divisors (see below), whose sum is σ = 81168026400. Its totient is φ = 10688788480.

The previous prime is 31231311283. The next prime is 31231311403. The reversal of 31231311320 is 2311313213.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31231311292 and 31231311301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2080175 + ... + 2095134.

Almost surely, 2^31231311320 is an apocalyptic number.

It is an amenable number.

31231311320 is an abundant number, since it is smaller than the sum of its proper divisors (49936715080).

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

31231311320 is a wasteful number, since it uses less digits than its factorization.

31231311320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4175348 (or 4175344 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31231311320 its reverse (2311313213), we get a palindrome (33542624533).

The spelling of 31231311320 in words is "thirty-one billion, two hundred thirty-one million, three hundred eleven thousand, three hundred twenty".