321344209 has 2 divisors, whose sum is σ = 321344210. Its totient is φ = 321344208.

The previous prime is 321344167. The next prime is 321344227. The reversal of 321344209 is 902443123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178302609 + 143041600 = 13353^2 + 11960^2 .

It is an emirp because it is prime and its reverse (902443123) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321344209 is a prime.

It is not a weakly prime, because it can be changed into another prime (321344249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160672104 + 160672105.

It is an arithmetic number, because the mean of its divisors is an integer number (160672105).

Almost surely, 2^321344209 is an apocalyptic number.

It is an amenable number.

321344209 is a deficient number, since it is larger than the sum of its proper divisors (1).

321344209 is an equidigital number, since it uses as much as digits as its factorization.

321344209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 321344209 is about 17926.0762298948. The cubic root of 321344209 is about 684.9467761939.

The spelling of 321344209 in words is "three hundred twenty-one million, three hundred forty-four thousand, two hundred nine".