317057521 has 4 divisors (see below), whose sum is σ = 345880944. Its totient is φ = 288234100.

The previous prime is 317057437. The next prime is 317057537. The reversal of 317057521 is 125750713.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 125750713 = 11 ⋅11431883.

It is not a de Polignac number, because 317057521 - 2¹³ = 317049329 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (317057561) 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, 14411695 + ... + 14411716.

It is an arithmetic number, because the mean of its divisors is an integer number (86470236).

Almost surely, 2^317057521 is an apocalyptic number.

It is an amenable number.

317057521 is a deficient number, since it is larger than the sum of its proper divisors (28823423).

317057521 is a wasteful number, since it uses less digits than its factorization.

317057521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28823422.

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

The square root of 317057521 is about 17806.1090921066. The cubic root of 317057521 is about 681.8874329396.

The spelling of 317057521 in words is "three hundred seventeen million, fifty-seven thousand, five hundred twenty-one".