31312111312 has 40 divisors (see below), whose sum is σ = 64848974400. Its totient is φ = 14610097920.

The previous prime is 31312111297. The next prime is 31312111319. The reversal of 31312111312 is 21311121313.

It is a super-2 number, since 2×31312111312² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31312111312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31312111319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1022562 + ... + 1052737.

It is an arithmetic number, because the mean of its divisors is an integer number (1621224360).

Almost surely, 2^31312111312 is an apocalyptic number.

It is an amenable number.

31312111312 is an abundant number, since it is smaller than the sum of its proper divisors (33536863088).

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

31312111312 is a wasteful number, since it uses less digits than its factorization.

31312111312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2075371 (or 2075365 counting only the distinct ones).

The product of its digits is 108, while the sum is 19.

Adding to 31312111312 its reverse (21311121313), we get a palindrome (52623232625).

The spelling of 31312111312 in words is "thirty-one billion, three hundred twelve million, one hundred eleven thousand, three hundred twelve".