317322721 has 2 divisors, whose sum is σ = 317322722. Its totient is φ = 317322720.

The previous prime is 317322703. The next prime is 317322737. The reversal of 317322721 is 127223713.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 236052496 + 81270225 = 15364^2 + 9015^2 .

It is a cyclic number.

It is not a de Polignac number, because 317322721 - 2⁹ = 317322209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 317322721.

It is not a weakly prime, because it can be changed into another prime (317322791) 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, 158661360 + 158661361.

It is an arithmetic number, because the mean of its divisors is an integer number (158661361).

Almost surely, 2^317322721 is an apocalyptic number.

It is an amenable number.

317322721 is a deficient number, since it is larger than the sum of its proper divisors (1).

317322721 is an equidigital number, since it uses as much as digits as its factorization.

317322721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 28.

The square root of 317322721 is about 17813.5544179145. The cubic root of 317322721 is about 682.0774995563.

It can be divided in two parts, 31732 and 2721, that added together give a triangular number (34453 = T₂₆₂).

The spelling of 317322721 in words is "three hundred seventeen million, three hundred twenty-two thousand, seven hundred twenty-one".