31311012012 has 48 divisors (see below), whose sum is σ = 88407567360. Its totient is φ = 8419767552.

The previous prime is 31311011993. The next prime is 31311012037. The reversal of 31311012012 is 21021011313.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31311011982 and 31311012000.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 10961812 + ... + 10964667.

It is an arithmetic number, because the mean of its divisors is an integer number (1841824320).

Almost surely, 2^31311012012 is an apocalyptic number.

It is an amenable number.

31311012012 is an abundant number, since it is smaller than the sum of its proper divisors (57096555348).

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

31311012012 is a wasteful number, since it uses less digits than its factorization.

31311012012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21926510 (or 21926508 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 31311012012 its reverse (21021011313), we get a palindrome (52332023325).

The spelling of 31311012012 in words is "thirty-one billion, three hundred eleven million, twelve thousand, twelve".