317963809 has 2 divisors, whose sum is σ = 317963810. Its totient is φ = 317963808.

The previous prime is 317963783. The next prime is 317963819. The reversal of 317963809 is 908369713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 291214225 + 26749584 = 17065^2 + 5172^2 .

It is a cyclic number.

It is not a de Polignac number, because 317963809 - 2⁹ = 317963297 is a prime.

It is a super-2 number, since 2×317963809² = 202201967667576962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (317963819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158981904 + 158981905.

It is an arithmetic number, because the mean of its divisors is an integer number (158981905).

Almost surely, 2^317963809 is an apocalyptic number.

It is an amenable number.

317963809 is a deficient number, since it is larger than the sum of its proper divisors (1).

317963809 is an equidigital number, since it uses as much as digits as its factorization.

317963809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 317963809 is about 17831.5397260024. The cubic root of 317963809 is about 682.5365249453.

The spelling of 317963809 in words is "three hundred seventeen million, nine hundred sixty-three thousand, eight hundred nine".