31311020001213 has 6 divisors (see below), whose sum is σ = 45227028890654. Its totient is φ = 20874013334136.

The previous prime is 31311020001059. The next prime is 31311020001251. The reversal of 31311020001213 is 31210002011313.

31311020001213 is a `hidden beast` number, since 31 + 311 + 0 + 200 + 0 + 121 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17631281877444 + 13679738123769 = 4198962^2 + 3698613^2 .

It is not a de Polignac number, because 31311020001213 - 2¹⁶ = 31311019935677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311020003213) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1739501111170 + ... + 1739501111187.

Almost surely, 2^{31311020001213} is an apocalyptic number.

It is an amenable number.

31311020001213 is a deficient number, since it is larger than the sum of its proper divisors (13916008889441).

31311020001213 is a wasteful number, since it uses less digits than its factorization.

31311020001213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3479002222363 (or 3479002222360 counting only the distinct ones).

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

Adding to 31311020001213 its reverse (31210002011313), we get a palindrome (62521022012526).

The spelling of 31311020001213 in words is "thirty-one trillion, three hundred eleven billion, twenty million, one thousand, two hundred thirteen".