317717861 has 2 divisors, whose sum is σ = 317717862. Its totient is φ = 317717860.

The previous prime is 317717833. The next prime is 317717893. The reversal of 317717861 is 168717713.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 317053636 + 664225 = 17806^2 + 815^2 .

It is an emirp because it is prime and its reverse (168717713) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 317717861 - 2⁶ = 317717797 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (317717801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158858930 + 158858931.

It is an arithmetic number, because the mean of its divisors is an integer number (158858931).

Almost surely, 2^317717861 is an apocalyptic number.

It is an amenable number.

317717861 is a deficient number, since it is larger than the sum of its proper divisors (1).

317717861 is an equidigital number, since it uses as much as digits as its factorization.

317717861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49392, while the sum is 41.

The square root of 317717861 is about 17824.6419599385. The cubic root of 317717861 is about 682.3604967416.

The spelling of 317717861 in words is "three hundred seventeen million, seven hundred seventeen thousand, eight hundred sixty-one".