311302393 has 2 divisors, whose sum is σ = 311302394. Its totient is φ = 311302392.

The previous prime is 311302367. The next prime is 311302399. The reversal of 311302393 is 393203113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230068224 + 81234169 = 15168^2 + 9013^2 .

It is an emirp because it is prime and its reverse (393203113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311302393 - 2⁵ = 311302361 is a prime.

It is not a weakly prime, because it can be changed into another prime (311302399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155651196 + 155651197.

It is an arithmetic number, because the mean of its divisors is an integer number (155651197).

Almost surely, 2^311302393 is an apocalyptic number.

It is an amenable number.

311302393 is a deficient number, since it is larger than the sum of its proper divisors (1).

311302393 is an equidigital number, since it uses as much as digits as its factorization.

311302393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 25.

The square root of 311302393 is about 17643.7635724354. The cubic root of 311302393 is about 677.7364129125.

The spelling of 311302393 in words is "three hundred eleven million, three hundred two thousand, three hundred ninety-three".