311421545251961 has 2 divisors, whose sum is σ = 311421545251962. Its totient is φ = 311421545251960.

The previous prime is 311421545251939. The next prime is 311421545252029. The reversal of 311421545251961 is 169152545124113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 173362805226361 + 138058740025600 = 13166731^2 + 11749840^2 .

It is a cyclic number.

It is not a de Polignac number, because 311421545251961 - 2⁶ = 311421545251897 is a prime.

It is not a weakly prime, because it can be changed into another prime (311421545251261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155710772625980 + 155710772625981.

It is an arithmetic number, because the mean of its divisors is an integer number (155710772625981).

Almost surely, 2^{311421545251961} is an apocalyptic number.

It is an amenable number.

311421545251961 is a deficient number, since it is larger than the sum of its proper divisors (1).

311421545251961 is an equidigital number, since it uses as much as digits as its factorization.

311421545251961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296000, while the sum is 50.

The spelling of 311421545251961 in words is "three hundred eleven trillion, four hundred twenty-one billion, five hundred forty-five million, two hundred fifty-one thousand, nine hundred sixty-one".