320442217 has 2 divisors, whose sum is σ = 320442218. Its totient is φ = 320442216.

The previous prime is 320442203. The next prime is 320442229. The reversal of 320442217 is 712244023.

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., 310323456 + 10118761 = 17616^2 + 3181^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320442217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 320442191 and 320442200.

It is not a weakly prime, because it can be changed into another prime (320442247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160221108 + 160221109.

It is an arithmetic number, because the mean of its divisors is an integer number (160221109).

Almost surely, 2^320442217 is an apocalyptic number.

It is an amenable number.

320442217 is a deficient number, since it is larger than the sum of its proper divisors (1).

320442217 is an equidigital number, since it uses as much as digits as its factorization.

320442217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 320442217 is about 17900.8998935808. The cubic root of 320442217 is about 684.3053088254.

The spelling of 320442217 in words is "three hundred twenty million, four hundred forty-two thousand, two hundred seventeen".