311938513 has 2 divisors, whose sum is σ = 311938514. Its totient is φ = 311938512.

The previous prime is 311938511. The next prime is 311938519. The reversal of 311938513 is 315839113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205291584 + 106646929 = 14328^2 + 10327^2 .

It is a cyclic number.

It is not a de Polignac number, because 311938513 - 2¹ = 311938511 is a prime.

Together with 311938511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (311938511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155969256 + 155969257.

It is an arithmetic number, because the mean of its divisors is an integer number (155969257).

Almost surely, 2^311938513 is an apocalyptic number.

It is an amenable number.

311938513 is a deficient number, since it is larger than the sum of its proper divisors (1).

311938513 is an equidigital number, since it uses as much as digits as its factorization.

311938513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 34.

The square root of 311938513 is about 17661.7811389452. The cubic root of 311938513 is about 678.1977310992.

The spelling of 311938513 in words is "three hundred eleven million, nine hundred thirty-eight thousand, five hundred thirteen".