311768893 has 2 divisors, whose sum is σ = 311768894. Its totient is φ = 311768892.

The previous prime is 311768867. The next prime is 311768903. The reversal of 311768893 is 398867113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206152164 + 105616729 = 14358^2 + 10277^2 .

It is an emirp because it is prime and its reverse (398867113) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311768893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311768293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155884446 + 155884447.

It is an arithmetic number, because the mean of its divisors is an integer number (155884447).

Almost surely, 2^311768893 is an apocalyptic number.

It is an amenable number.

311768893 is a deficient number, since it is larger than the sum of its proper divisors (1).

311768893 is an equidigital number, since it uses as much as digits as its factorization.

311768893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 46.

The square root of 311768893 is about 17656.9785920468. The cubic root of 311768893 is about 678.0747829846.

It can be divided in two parts, 3117 and 68893, that added together give a triangular number (72010 = T₃₇₉).

The spelling of 311768893 in words is "three hundred eleven million, seven hundred sixty-eight thousand, eight hundred ninety-three".