311865013 has 2 divisors, whose sum is σ = 311865014. Its totient is φ = 311865012.

The previous prime is 311865007. The next prime is 311865079. The reversal of 311865013 is 310568113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209004849 + 102860164 = 14457^2 + 10142^2 .

It is an emirp because it is prime and its reverse (310568113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311865013 - 2¹³ = 311856821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311865413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155932506 + 155932507.

It is an arithmetic number, because the mean of its divisors is an integer number (155932507).

Almost surely, 2^311865013 is an apocalyptic number.

It is an amenable number.

311865013 is a deficient number, since it is larger than the sum of its proper divisors (1).

311865013 is an equidigital number, since it uses as much as digits as its factorization.

311865013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 311865013 is about 17659.7002522693. The cubic root of 311865013 is about 678.1444605060.

The spelling of 311865013 in words is "three hundred eleven million, eight hundred sixty-five thousand, thirteen".