31311201213 has 8 divisors (see below), whose sum is σ = 46386964800. Its totient is φ = 20874134124.

The previous prime is 31311201209. The next prime is 31311201223. The reversal of 31311201213 is 31210211313.

It is not a de Polignac number, because 31311201213 - 2² = 31311201209 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311201203) 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, 579837033 + ... + 579837086.

It is an arithmetic number, because the mean of its divisors is an integer number (5798370600).

Almost surely, 2^31311201213 is an apocalyptic number.

It is an amenable number.

31311201213 is a deficient number, since it is larger than the sum of its proper divisors (15075763587).

31311201213 is a wasteful number, since it uses less digits than its factorization.

31311201213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1159674128 (or 1159674122 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 31311201213 its reverse (31210211313), we get a palindrome (62521412526).

The spelling of 31311201213 in words is "thirty-one billion, three hundred eleven million, two hundred one thousand, two hundred thirteen".