317371721 has 2 divisors, whose sum is σ = 317371722. Its totient is φ = 317371720.

The previous prime is 317371673. The next prime is 317371727. The reversal of 317371721 is 127173713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 265690000 + 51681721 = 16300^2 + 7189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-317371721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (317371727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158685860 + 158685861.

It is an arithmetic number, because the mean of its divisors is an integer number (158685861).

Almost surely, 2^317371721 is an apocalyptic number.

It is an amenable number.

317371721 is a deficient number, since it is larger than the sum of its proper divisors (1).

317371721 is an equidigital number, since it uses as much as digits as its factorization.

317371721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6174, while the sum is 32.

The square root of 317371721 is about 17814.9297220056. The cubic root of 317371721 is about 682.1126058536.

The spelling of 317371721 in words is "three hundred seventeen million, three hundred seventy-one thousand, seven hundred twenty-one".