317321 has 2 divisors, whose sum is σ = 317322. Its totient is φ = 317320.

The previous prime is 317279. The next prime is 317323. The reversal of 317321 is 123713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 313600 + 3721 = 560^2 + 61^2 .

It is a cyclic number.

It is not a de Polignac number, because 317321 - 2⁶ = 317257 is a prime.

It is a Sophie Germain prime.

Together with 317323, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 317321.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 317321.

It is not a weakly prime, because it can be changed into another prime (317323) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158660 + 158661.

It is an arithmetic number, because the mean of its divisors is an integer number (158661).

2³¹⁷³²¹ is an apocalyptic number.

It is an amenable number.

317321 is a deficient number, since it is larger than the sum of its proper divisors (1).

317321 is an equidigital number, since it uses as much as digits as its factorization.

317321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 126, while the sum is 17.

The square root of 317321 is about 563.3125242705. The cubic root of 317321 is about 68.2076266471.

The spelling of 317321 in words is "three hundred seventeen thousand, three hundred twenty-one", and thus it is an iban number.