328646621 has 2 divisors, whose sum is σ = 328646622. Its totient is φ = 328646620.

The previous prime is 328646597. The next prime is 328646653. The reversal of 328646621 is 126646823.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 223173721 + 105472900 = 14939^2 + 10270^2 .

It is an emirp because it is prime and its reverse (126646823) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 328646621 - 2¹⁸ = 328384477 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (328646671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164323310 + 164323311.

It is an arithmetic number, because the mean of its divisors is an integer number (164323311).

Almost surely, 2^328646621 is an apocalyptic number.

It is an amenable number.

328646621 is a deficient number, since it is larger than the sum of its proper divisors (1).

328646621 is an equidigital number, since it uses as much as digits as its factorization.

328646621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 38.

The square root of 328646621 is about 18128.6133225903. The cubic root of 328646621 is about 690.0963395553.

The spelling of 328646621 in words is "three hundred twenty-eight million, six hundred forty-six thousand, six hundred twenty-one".