328609969 has 2 divisors, whose sum is σ = 328609970. Its totient is φ = 328609968.

The previous prime is 328609937. The next prime is 328609973. The reversal of 328609969 is 969906823.

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., 251381025 + 77228944 = 15855^2 + 8788^2 .

It is an emirp because it is prime and its reverse (969906823) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 328609969 - 2⁵ = 328609937 is a prime.

It is a super-2 number, since 2×328609969² = 215969023452361922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (328609979) 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, 164304984 + 164304985.

It is an arithmetic number, because the mean of its divisors is an integer number (164304985).

Almost surely, 2^328609969 is an apocalyptic number.

It is an amenable number.

328609969 is a deficient number, since it is larger than the sum of its proper divisors (1).

328609969 is an equidigital number, since it uses as much as digits as its factorization.

328609969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1259712, while the sum is 52.

The square root of 328609969 is about 18127.6024062754. The cubic root of 328609969 is about 690.0706844902.

The spelling of 328609969 in words is "three hundred twenty-eight million, six hundred nine thousand, nine hundred sixty-nine".