317606221 has 2 divisors, whose sum is σ = 317606222. Its totient is φ = 317606220.

The previous prime is 317606207. The next prime is 317606239. The reversal of 317606221 is 122606713.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 224580196 + 93026025 = 14986^2 + 9645^2 .

It is an emirp because it is prime and its reverse (122606713) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 317606221 - 2²⁷ = 183388493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 317606221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (317606021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158803110 + 158803111.

It is an arithmetic number, because the mean of its divisors is an integer number (158803111).

Almost surely, 2^317606221 is an apocalyptic number.

It is an amenable number.

317606221 is a deficient number, since it is larger than the sum of its proper divisors (1).

317606221 is an equidigital number, since it uses as much as digits as its factorization.

317606221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 317606221 is about 17821.5100650871. The cubic root of 317606221 is about 682.2805645548.

The spelling of 317606221 in words is "three hundred seventeen million, six hundred six thousand, two hundred twenty-one".