311275213 has 2 divisors, whose sum is σ = 311275214. Its totient is φ = 311275212.

The previous prime is 311275199. The next prime is 311275243. The reversal of 311275213 is 312572113.

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., 245956489 + 65318724 = 15683^2 + 8082^2 .

It is a cyclic number.

It is not a de Polignac number, because 311275213 - 2²¹ = 309178061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311275243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155637606 + 155637607.

It is an arithmetic number, because the mean of its divisors is an integer number (155637607).

Almost surely, 2^311275213 is an apocalyptic number.

It is an amenable number.

311275213 is a deficient number, since it is larger than the sum of its proper divisors (1).

311275213 is an equidigital number, since it uses as much as digits as its factorization.

311275213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1260, while the sum is 25.

The square root of 311275213 is about 17642.9933117938. The cubic root of 311275213 is about 677.7166878132.

The spelling of 311275213 in words is "three hundred eleven million, two hundred seventy-five thousand, two hundred thirteen".