312939217 has 2 divisors, whose sum is σ = 312939218. Its totient is φ = 312939216.

The previous prime is 312939161. The next prime is 312939227. The reversal of 312939217 is 712939213.

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., 262472401 + 50466816 = 16201^2 + 7104^2 .

It is a cyclic number.

It is not a de Polignac number, because 312939217 - 2²⁷ = 178721489 is a prime.

It is not a weakly prime, because it can be changed into another prime (312939227) 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, 156469608 + 156469609.

It is an arithmetic number, because the mean of its divisors is an integer number (156469609).

Almost surely, 2^312939217 is an apocalyptic number.

It is an amenable number.

312939217 is a deficient number, since it is larger than the sum of its proper divisors (1).

312939217 is an equidigital number, since it uses as much as digits as its factorization.

312939217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412, while the sum is 37.

The square root of 312939217 is about 17690.0881004024. The cubic root of 312939217 is about 678.9221802143.

The spelling of 312939217 in words is "three hundred twelve million, nine hundred thirty-nine thousand, two hundred seventeen".