317319809 has 2 divisors, whose sum is σ = 317319810. Its totient is φ = 317319808.

The previous prime is 317319791. The next prime is 317319829. The reversal of 317319809 is 908913713.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 301890625 + 15429184 = 17375^2 + 3928^2 .

It is an emirp because it is prime and its reverse (908913713) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 317319809 - 2⁸ = 317319553 is a prime.

It is a super-2 number, since 2×317319809² = 201383722367592962, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (317319829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158659904 + 158659905.

It is an arithmetic number, because the mean of its divisors is an integer number (158659905).

Almost surely, 2^317319809 is an apocalyptic number.

It is an amenable number.

317319809 is a deficient number, since it is larger than the sum of its proper divisors (1).

317319809 is an equidigital number, since it uses as much as digits as its factorization.

317319809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 317319809 is about 17813.4726822144. The cubic root of 317319809 is about 682.0754131254.

The spelling of 317319809 in words is "three hundred seventeen million, three hundred nineteen thousand, eight hundred nine".