317706989 has 2 divisors, whose sum is σ = 317706990. Its totient is φ = 317706988.

The previous prime is 317706937. The next prime is 317707009. The reversal of 317706989 is 989607713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 289170025 + 28536964 = 17005^2 + 5342^2 .

It is an emirp because it is prime and its reverse (989607713) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 317706989 - 2¹² = 317702893 is a prime.

It is a super-2 number, since 2×317706989² = 201875461718892242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (317706929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158853494 + 158853495.

It is an arithmetic number, because the mean of its divisors is an integer number (158853495).

Almost surely, 2^317706989 is an apocalyptic number.

It is an amenable number.

317706989 is a deficient number, since it is larger than the sum of its proper divisors (1).

317706989 is an equidigital number, since it uses as much as digits as its factorization.

317706989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 571536, while the sum is 50.

The square root of 317706989 is about 17824.3369862668. The cubic root of 317706989 is about 682.3527134126.

The spelling of 317706989 in words is "three hundred seventeen million, seven hundred six thousand, nine hundred eighty-nine".