31313311320 has 64 divisors (see below), whose sum is σ = 94459004640. Its totient is φ = 8304076800.

The previous prime is 31313311303. The next prime is 31313311333. The reversal of 31313311320 is 2311331313.

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, 699121 + ... + 742560.

Almost surely, 2^31313311320 is an apocalyptic number.

31313311320 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31313311320 is an abundant number, since it is smaller than the sum of its proper divisors (63145693320).

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

31313311320 is a wasteful number, since it uses less digits than its factorization.

31313311320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1441876 (or 1441872 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 21.

Adding to 31313311320 its reverse (2311331313), we get a palindrome (33624642633).

The spelling of 31313311320 in words is "thirty-one billion, three hundred thirteen million, three hundred eleven thousand, three hundred twenty".