31211330213113 has 2 divisors, whose sum is σ = 31211330213114. Its totient is φ = 31211330213112.

The previous prime is 31211330213069. The next prime is 31211330213201. The reversal of 31211330213113 is 31131203311213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20199199899904 + 11012130313209 = 4494352^2 + 3318453^2 .

It is a cyclic number.

It is not a de Polignac number, because 31211330213113 - 2²⁵ = 31211296658681 is a prime.

It is not a weakly prime, because it can be changed into another prime (31211330213213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15605665106556 + 15605665106557.

It is an arithmetic number, because the mean of its divisors is an integer number (15605665106557).

Almost surely, 2^{31211330213113} is an apocalyptic number.

It is an amenable number.

31211330213113 is a deficient number, since it is larger than the sum of its proper divisors (1).

31211330213113 is an equidigital number, since it uses as much as digits as its factorization.

31211330213113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 25.

Adding to 31211330213113 its reverse (31131203311213), we get a palindrome (62342533524326).

The spelling of 31211330213113 in words is "thirty-one trillion, two hundred eleven billion, three hundred thirty million, two hundred thirteen thousand, one hundred thirteen".