313203217 has 2 divisors, whose sum is σ = 313203218. Its totient is φ = 313203216.

The previous prime is 313203197. The next prime is 313203221. The reversal of 313203217 is 712302313.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 266636241 + 46566976 = 16329^2 + 6824^2 .

It is an emirp because it is prime and its reverse (712302313) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313203217 is a prime.

It is not a weakly prime, because it can be changed into another prime (313203287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156601608 + 156601609.

It is an arithmetic number, because the mean of its divisors is an integer number (156601609).

Almost surely, 2^313203217 is an apocalyptic number.

It is an amenable number.

313203217 is a deficient number, since it is larger than the sum of its proper divisors (1).

313203217 is an equidigital number, since it uses as much as digits as its factorization.

313203217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 313203217 is about 17697.5483330319. The cubic root of 313203217 is about 679.1130427073.

The spelling of 313203217 in words is "three hundred thirteen million, two hundred three thousand, two hundred seventeen".