317812213 has 2 divisors, whose sum is σ = 317812214. Its totient is φ = 317812212.

The previous prime is 317812207. The next prime is 317812237. The reversal of 317812213 is 312218713.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 226743364 + 91068849 = 15058^2 + 9543^2 .

It is an emirp because it is prime and its reverse (312218713) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 317812213 - 2¹³ = 317804021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (317812273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158906106 + 158906107.

It is an arithmetic number, because the mean of its divisors is an integer number (158906107).

Almost surely, 2^317812213 is an apocalyptic number.

It is an amenable number.

317812213 is a deficient number, since it is larger than the sum of its proper divisors (1).

317812213 is an equidigital number, since it uses as much as digits as its factorization.

317812213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 28.

The square root of 317812213 is about 17827.2884365514. The cubic root of 317812213 is about 682.4280364400.

The spelling of 317812213 in words is "three hundred seventeen million, eight hundred twelve thousand, two hundred thirteen".