317564221 has 4 divisors (see below), whose sum is σ = 341992252. Its totient is φ = 293136192.

The previous prime is 317564209. The next prime is 317564249. The reversal of 317564221 is 122465713.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122465713 = 271 ⋅451903.

It can be written as a sum of positive squares in 2 ways, for example, as 53144100 + 264420121 = 7290^2 + 16261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-317564221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (317564521) 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 in 3 ways as a sum of consecutive naturals, for example, 12213996 + ... + 12214021.

It is an arithmetic number, because the mean of its divisors is an integer number (85498063).

Almost surely, 2^317564221 is an apocalyptic number.

It is an amenable number.

317564221 is a deficient number, since it is larger than the sum of its proper divisors (24428031).

317564221 is a wasteful number, since it uses less digits than its factorization.

317564221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24428030.

The product of its digits is 10080, while the sum is 31.

The square root of 317564221 is about 17820.3316748034. The cubic root of 317564221 is about 682.2504884784.

The spelling of 317564221 in words is "three hundred seventeen million, five hundred sixty-four thousand, two hundred twenty-one".