317138321 has 4 divisors (see below), whose sum is σ = 324873444. Its totient is φ = 309403200.

The previous prime is 317138317. The next prime is 317138333. The reversal of 317138321 is 123831713.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59985025 + 257153296 = 7745^2 + 16036^2 .

It is a cyclic number.

It is not a de Polignac number, because 317138321 - 2² = 317138317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (317138821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3867500 + ... + 3867581.

It is an arithmetic number, because the mean of its divisors is an integer number (81218361).

Almost surely, 2^317138321 is an apocalyptic number.

It is an amenable number.

317138321 is a deficient number, since it is larger than the sum of its proper divisors (7735123).

317138321 is an equidigital number, since it uses as much as digits as its factorization.

317138321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7735122.

The product of its digits is 3024, while the sum is 29.

The square root of 317138321 is about 17808.3778317959. The cubic root of 317138321 is about 681.9453528451.

The spelling of 317138321 in words is "three hundred seventeen million, one hundred thirty-eight thousand, three hundred twenty-one".