328335221 has 2 divisors, whose sum is σ = 328335222. Its totient is φ = 328335220.

The previous prime is 328335197. The next prime is 328335223. The reversal of 328335221 is 122533823.

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., 271920100 + 56415121 = 16490^2 + 7511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-328335221 is a prime.

Together with 328335223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (328335223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164167610 + 164167611.

It is an arithmetic number, because the mean of its divisors is an integer number (164167611).

Almost surely, 2^328335221 is an apocalyptic number.

It is an amenable number.

328335221 is a deficient number, since it is larger than the sum of its proper divisors (1).

328335221 is an equidigital number, since it uses as much as digits as its factorization.

328335221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 29.

The square root of 328335221 is about 18120.0226545112. The cubic root of 328335221 is about 689.8783101228.

The spelling of 328335221 in words is "three hundred twenty-eight million, three hundred thirty-five thousand, two hundred twenty-one".