321199409 has 2 divisors, whose sum is σ = 321199410. Its totient is φ = 321199408.

The previous prime is 321199399. The next prime is 321199433. The reversal of 321199409 is 904991123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 306145009 + 15054400 = 17497^2 + 3880^2 .

It is a cyclic number.

It is not a de Polignac number, because 321199409 - 2¹² = 321195313 is a prime.

It is not a weakly prime, because it can be changed into another prime (321199609) 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, 160599704 + 160599705.

It is an arithmetic number, because the mean of its divisors is an integer number (160599705).

Almost surely, 2^321199409 is an apocalyptic number.

It is an amenable number.

321199409 is a deficient number, since it is larger than the sum of its proper divisors (1).

321199409 is an equidigital number, since it uses as much as digits as its factorization.

321199409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 321199409 is about 17922.0369657023. The cubic root of 321199409 is about 684.8438800976.

The spelling of 321199409 in words is "three hundred twenty-one million, one hundred ninety-nine thousand, four hundred nine".