318399691 has 2 divisors, whose sum is σ = 318399692. Its totient is φ = 318399690.

The previous prime is 318399617. The next prime is 318399707. The reversal of 318399691 is 196993813.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-318399691 is a prime.

It is not a weakly prime, because it can be changed into another prime (318399491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159199845 + 159199846.

It is an arithmetic number, because the mean of its divisors is an integer number (159199846).

Almost surely, 2^318399691 is an apocalyptic number.

318399691 is a deficient number, since it is larger than the sum of its proper divisors (1).

318399691 is an equidigital number, since it uses as much as digits as its factorization.

318399691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 314928, while the sum is 49.

The square root of 318399691 is about 17843.7577600684. The cubic root of 318399691 is about 682.8482685412.

The spelling of 318399691 in words is "three hundred eighteen million, three hundred ninety-nine thousand, six hundred ninety-one".