317505817 has 2 divisors, whose sum is σ = 317505818. Its totient is φ = 317505816.

The previous prime is 317505781. The next prime is 317505829. The reversal of 317505817 is 718505713.

Together with previous prime (317505781) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 316697616 + 808201 = 17796^2 + 899^2 .

It is a cyclic number.

It is not a de Polignac number, because 317505817 - 2¹⁵ = 317473049 is a prime.

It is not a weakly prime, because it can be changed into another prime (317505887) 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, 158752908 + 158752909.

It is an arithmetic number, because the mean of its divisors is an integer number (158752909).

Almost surely, 2^317505817 is an apocalyptic number.

It is an amenable number.

317505817 is a deficient number, since it is larger than the sum of its proper divisors (1).

317505817 is an equidigital number, since it uses as much as digits as its factorization.

317505817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29400, while the sum is 37.

The square root of 317505817 is about 17818.6929094140. The cubic root of 317505817 is about 682.2086611378.

The spelling of 317505817 in words is "three hundred seventeen million, five hundred five thousand, eight hundred seventeen".