317217661 has 2 divisors, whose sum is σ = 317217662. Its totient is φ = 317217660.

The previous prime is 317217653. The next prime is 317217683. The reversal of 317217661 is 166712713.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 317053636 + 164025 = 17806^2 + 405^2 .

It is a cyclic number.

It is not a de Polignac number, because 317217661 - 2³ = 317217653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (327217661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158608830 + 158608831.

It is an arithmetic number, because the mean of its divisors is an integer number (158608831).

Almost surely, 2^317217661 is an apocalyptic number.

It is an amenable number.

317217661 is a deficient number, since it is larger than the sum of its proper divisors (1).

317217661 is an equidigital number, since it uses as much as digits as its factorization.

317217661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10584, while the sum is 34.

The square root of 317217661 is about 17810.6052957220. The cubic root of 317217661 is about 682.0022166060.

The spelling of 317217661 in words is "three hundred seventeen million, two hundred seventeen thousand, six hundred sixty-one".