31311201212 has 12 divisors (see below), whose sum is σ = 54854232720. Its totient is φ = 15638563296.

The previous prime is 31311201209. The next prime is 31311201223. The reversal of 31311201212 is 21210211313.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 4255193 + ... + 4262544.

It is an arithmetic number, because the mean of its divisors is an integer number (4571186060).

Almost surely, 2^31311201212 is an apocalyptic number.

It is an amenable number.

31311201212 is a deficient number, since it is larger than the sum of its proper divisors (23543031508).

31311201212 is a wasteful number, since it uses less digits than its factorization.

31311201212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8518660 (or 8518658 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31311201212 its reverse (21210211313), we get a palindrome (52521412525).

The spelling of 31311201212 in words is "thirty-one billion, three hundred eleven million, two hundred one thousand, two hundred twelve".