521000317 has 2 divisors, whose sum is σ = 521000318. Its totient is φ = 521000316.

The previous prime is 521000303. The next prime is 521000321. The reversal of 521000317 is 713000125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 504182116 + 16818201 = 22454^2 + 4101^2 .

It is a cyclic number.

It is not a de Polignac number, because 521000317 - 2⁷ = 521000189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 521000294 and 521000303.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521000357) 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, 260500158 + 260500159.

It is an arithmetic number, because the mean of its divisors is an integer number (260500159).

Almost surely, 2^521000317 is an apocalyptic number.

It is an amenable number.

521000317 is a deficient number, since it is larger than the sum of its proper divisors (1).

521000317 is an equidigital number, since it uses as much as digits as its factorization.

521000317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 521000317 is about 22825.4313650367. The cubic root of 521000317 is about 804.6604624946.

The spelling of 521000317 in words is "five hundred twenty-one million, three hundred seventeen", and thus it is an aban number.