31131330312 has 32 divisors (see below), whose sum is σ = 77842226880. Its totient is φ = 10375256640.

The previous prime is 31131330301. The next prime is 31131330313. The reversal of 31131330312 is 21303313113.

It is not an unprimeable number, because it can be changed into a prime (31131330313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24813 + ... + 250755.

It is an arithmetic number, because the mean of its divisors is an integer number (2432569590).

Almost surely, 2^31131330312 is an apocalyptic number.

It is an amenable number.

31131330312 is an abundant number, since it is smaller than the sum of its proper divisors (46710896568).

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

31131330312 is a wasteful number, since it uses less digits than its factorization.

31131330312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231693 (or 231689 counting only the distinct ones).

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

Adding to 31131330312 its reverse (21303313113), we get a palindrome (52434643425).

The spelling of 31131330312 in words is "thirty-one billion, one hundred thirty-one million, three hundred thirty thousand, three hundred twelve".