311397939817 has 2 divisors, whose sum is σ = 311397939818. Its totient is φ = 311397939816.

The previous prime is 311397939793. The next prime is 311397939821. The reversal of 311397939817 is 718939793113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 296522722521 + 14875217296 = 544539^2 + 121964^2 .

It is a cyclic number.

It is not a de Polignac number, because 311397939817 - 2¹⁹ = 311397415529 is a prime.

It is not a weakly prime, because it can be changed into another prime (311397939857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155698969908 + 155698969909.

It is an arithmetic number, because the mean of its divisors is an integer number (155698969909).

Almost surely, 2^311397939817 is an apocalyptic number.

It is an amenable number.

311397939817 is a deficient number, since it is larger than the sum of its proper divisors (1).

311397939817 is an equidigital number, since it uses as much as digits as its factorization.

311397939817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7715736, while the sum is 61.

The spelling of 311397939817 in words is "three hundred eleven billion, three hundred ninety-seven million, nine hundred thirty-nine thousand, eight hundred seventeen".