313722217 has 2 divisors, whose sum is σ = 313722218. Its totient is φ = 313722216.

The previous prime is 313722209. The next prime is 313722257. The reversal of 313722217 is 712227313.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 254370601 + 59351616 = 15949^2 + 7704^2 .

It is a cyclic number.

It is not a de Polignac number, because 313722217 - 2³ = 313722209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (313722257) 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, 156861108 + 156861109.

It is an arithmetic number, because the mean of its divisors is an integer number (156861109).

Almost surely, 2^313722217 is an apocalyptic number.

It is an amenable number.

313722217 is a deficient number, since it is larger than the sum of its proper divisors (1).

313722217 is an equidigital number, since it uses as much as digits as its factorization.

313722217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 28.

The square root of 313722217 is about 17712.2053115923. The cubic root of 313722217 is about 679.4879485677.

The spelling of 313722217 in words is "three hundred thirteen million, seven hundred twenty-two thousand, two hundred seventeen".