311320421040509 has 2 divisors, whose sum is σ = 311320421040510. Its totient is φ = 311320421040508.

The previous prime is 311320421040481. The next prime is 311320421040661. The reversal of 311320421040509 is 905040124023113.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 173861445036409 + 137458976004100 = 13185653^2 + 11724290^2 .

It is a cyclic number.

It is not a de Polignac number, because 311320421040509 - 2³⁶ = 311251701563773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311320421043509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155660210520254 + 155660210520255.

It is an arithmetic number, because the mean of its divisors is an integer number (155660210520255).

Almost surely, 2^{311320421040509} is an apocalyptic number.

It is an amenable number.

311320421040509 is a deficient number, since it is larger than the sum of its proper divisors (1).

311320421040509 is an equidigital number, since it uses as much as digits as its factorization.

311320421040509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 311320421040509 in words is "three hundred eleven trillion, three hundred twenty billion, four hundred twenty-one million, forty thousand, five hundred nine".