317575021 has 2 divisors, whose sum is σ = 317575022. Its totient is φ = 317575020.

The previous prime is 317574979. The next prime is 317575031. The reversal of 317575021 is 120575713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 275194921 + 42380100 = 16589^2 + 6510^2 .

It is a cyclic number.

It is not a de Polignac number, because 317575021 - 2¹⁷ = 317443949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (317575031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158787510 + 158787511.

It is an arithmetic number, because the mean of its divisors is an integer number (158787511).

Almost surely, 2^317575021 is an apocalyptic number.

It is an amenable number.

317575021 is a deficient number, since it is larger than the sum of its proper divisors (1).

317575021 is an equidigital number, since it uses as much as digits as its factorization.

317575021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7350, while the sum is 31.

The square root of 317575021 is about 17820.6346968900. The cubic root of 317575021 is about 682.2582225799.

The spelling of 317575021 in words is "three hundred seventeen million, five hundred seventy-five thousand, twenty-one".