318226217 has 2 divisors, whose sum is σ = 318226218. Its totient is φ = 318226216.

The previous prime is 318226177. The next prime is 318226219. The reversal of 318226217 is 712622813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200958976 + 117267241 = 14176^2 + 10829^2 .

It is a cyclic number.

It is not a de Polignac number, because 318226217 - 2²⁸ = 49790761 is a prime.

It is a super-2 number, since 2×318226217² = 202535850372262178, which contains 22 as substring.

Together with 318226219, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (318226219) 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, 159113108 + 159113109.

It is an arithmetic number, because the mean of its divisors is an integer number (159113109).

Almost surely, 2^318226217 is an apocalyptic number.

It is an amenable number.

318226217 is a deficient number, since it is larger than the sum of its proper divisors (1).

318226217 is an equidigital number, since it uses as much as digits as its factorization.

318226217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 32.

The square root of 318226217 is about 17838.8961822193. The cubic root of 318226217 is about 682.7242337265.

The spelling of 318226217 in words is "three hundred eighteen million, two hundred twenty-six thousand, two hundred seventeen".