31311211320313 has 2 divisors, whose sum is σ = 31311211320314. Its totient is φ = 31311211320312.

The previous prime is 31311211320307. The next prime is 31311211320383. The reversal of 31311211320313 is 31302311211313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29945005673209 + 1366205647104 = 5472203^2 + 1168848^2 .

It is a cyclic number.

It is not a de Polignac number, because 31311211320313 - 2¹⁷ = 31311211189241 is a prime.

It is not a weakly prime, because it can be changed into another prime (31311211320383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15655605660156 + 15655605660157.

It is an arithmetic number, because the mean of its divisors is an integer number (15655605660157).

Almost surely, 2^{31311211320313} is an apocalyptic number.

It is an amenable number.

31311211320313 is a deficient number, since it is larger than the sum of its proper divisors (1).

31311211320313 is an equidigital number, since it uses as much as digits as its factorization.

31311211320313 is an odious number, because the sum of its binary digits is odd.

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

Adding to 31311211320313 its reverse (31302311211313), we get a palindrome (62613522531626).

The spelling of 31311211320313 in words is "thirty-one trillion, three hundred eleven billion, two hundred eleven million, three hundred twenty thousand, three hundred thirteen".