31311201320 has 32 divisors (see below), whose sum is σ = 80514518400. Its totient is φ = 10735268928.

The previous prime is 31311201269. The next prime is 31311201323. The reversal of 31311201320 is 2310211313.

It is not an unprimeable number, because it can be changed into a prime (31311201323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55912580 + ... + 55913139.

It is an arithmetic number, because the mean of its divisors is an integer number (2516078700).

Almost surely, 2^31311201320 is an apocalyptic number.

It is an amenable number.

31311201320 is an abundant number, since it is smaller than the sum of its proper divisors (49203317080).

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

31311201320 is a wasteful number, since it uses less digits than its factorization.

31311201320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111825737 (or 111825733 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31311201320 its reverse (2310211313), we get a palindrome (33621412633).

The spelling of 31311201320 in words is "thirty-one billion, three hundred eleven million, two hundred one thousand, three hundred twenty".