317720609 has 2 divisors, whose sum is σ = 317720610. Its totient is φ = 317720608.

The previous prime is 317720587. The next prime is 317720621. The reversal of 317720609 is 906027713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 265592209 + 52128400 = 16297^2 + 7220^2 .

It is a cyclic number.

It is not a de Polignac number, because 317720609 - 2²⁰ = 316672033 is a prime.

It is not a weakly prime, because it can be changed into another prime (317720629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158860304 + 158860305.

It is an arithmetic number, because the mean of its divisors is an integer number (158860305).

Almost surely, 2^317720609 is an apocalyptic number.

It is an amenable number.

317720609 is a deficient number, since it is larger than the sum of its proper divisors (1).

317720609 is an equidigital number, since it uses as much as digits as its factorization.

317720609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 317720609 is about 17824.7190440691. The cubic root of 317720609 is about 682.3624640229.

The spelling of 317720609 in words is "three hundred seventeen million, seven hundred twenty thousand, six hundred nine".