312303217 has 2 divisors, whose sum is σ = 312303218. Its totient is φ = 312303216.

The previous prime is 312303197. The next prime is 312303221. The reversal of 312303217 is 712303213.

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., 257409936 + 54893281 = 16044^2 + 7409^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312303217 is a prime.

It is not a weakly prime, because it can be changed into another prime (312303917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156151608 + 156151609.

It is an arithmetic number, because the mean of its divisors is an integer number (156151609).

Almost surely, 2^312303217 is an apocalyptic number.

It is an amenable number.

312303217 is a deficient number, since it is larger than the sum of its proper divisors (1).

312303217 is an equidigital number, since it uses as much as digits as its factorization.

312303217 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 312303217 is about 17672.1027894249. The cubic root of 312303217 is about 678.4619339086.

The spelling of 312303217 in words is "three hundred twelve million, three hundred three thousand, two hundred seventeen".