311698913 has 2 divisors, whose sum is σ = 311698914. Its totient is φ = 311698912.

The previous prime is 311698903. The next prime is 311698951. The reversal of 311698913 is 319896113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 311451904 + 247009 = 17648^2 + 497^2 .

It is an emirp because it is prime and its reverse (319896113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311698913 - 2⁴ = 311698897 is a prime.

It is not a weakly prime, because it can be changed into another prime (311698903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155849456 + 155849457.

It is an arithmetic number, because the mean of its divisors is an integer number (155849457).

Almost surely, 2^311698913 is an apocalyptic number.

It is an amenable number.

311698913 is a deficient number, since it is larger than the sum of its proper divisors (1).

311698913 is an equidigital number, since it uses as much as digits as its factorization.

311698913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 41.

The square root of 311698913 is about 17654.9968280937. The cubic root of 311698913 is about 678.0240453761.

The spelling of 311698913 in words is "three hundred eleven million, six hundred ninety-eight thousand, nine hundred thirteen".