311959493 has 2 divisors, whose sum is σ = 311959494. Its totient is φ = 311959492.

The previous prime is 311959489. The next prime is 311959513. The reversal of 311959493 is 394959113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 296459524 + 15499969 = 17218^2 + 3937^2 .

It is a cyclic number.

It is not a de Polignac number, because 311959493 - 2² = 311959489 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311929493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155979746 + 155979747.

It is an arithmetic number, because the mean of its divisors is an integer number (155979747).

Almost surely, 2^311959493 is an apocalyptic number.

It is an amenable number.

311959493 is a deficient number, since it is larger than the sum of its proper divisors (1).

311959493 is an equidigital number, since it uses as much as digits as its factorization.

311959493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 131220, while the sum is 44.

The square root of 311959493 is about 17662.3750667910. The cubic root of 311959493 is about 678.2129352381.

The spelling of 311959493 in words is "three hundred eleven million, nine hundred fifty-nine thousand, four hundred ninety-three".