317129521 has 2 divisors, whose sum is σ = 317129522. Its totient is φ = 317129520.

The previous prime is 317129507. The next prime is 317129531. The reversal of 317129521 is 125921713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 260338225 + 56791296 = 16135^2 + 7536^2 .

It is an emirp because it is prime and its reverse (125921713) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 317129521 - 2¹⁵ = 317096753 is a prime.

It is a super-2 number, since 2×317129521² = 201142266179378882, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 317129521 parts by 25184 straight cuts.

It is equal to p_17128804 and since 317129521 and 17128804 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (317129531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158564760 + 158564761.

It is an arithmetic number, because the mean of its divisors is an integer number (158564761).

Almost surely, 2^317129521 is an apocalyptic number.

It is an amenable number.

317129521 is a deficient number, since it is larger than the sum of its proper divisors (1).

317129521 is an equidigital number, since it uses as much as digits as its factorization.

317129521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 31.

The square root of 317129521 is about 17808.1307553600. The cubic root of 317129521 is about 681.9390452140.

The spelling of 317129521 in words is "three hundred seventeen million, one hundred twenty-nine thousand, five hundred twenty-one".