315768991 has 2 divisors, whose sum is σ = 315768992. Its totient is φ = 315768990.

The previous prime is 315768977. The next prime is 315769039. The reversal of 315768991 is 199867513.

It is a weak prime.

It is an emirp because it is prime and its reverse (199867513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 315768991 - 2²⁷ = 181551263 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315768091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157884495 + 157884496.

It is an arithmetic number, because the mean of its divisors is an integer number (157884496).

Almost surely, 2^315768991 is an apocalyptic number.

315768991 is a deficient number, since it is larger than the sum of its proper divisors (1).

315768991 is an equidigital number, since it uses as much as digits as its factorization.

315768991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 49.

The square root of 315768991 is about 17769.8900109145. The cubic root of 315768991 is about 680.9624426650.

The spelling of 315768991 in words is "three hundred fifteen million, seven hundred sixty-eight thousand, nine hundred ninety-one".