328376621 has 2 divisors, whose sum is σ = 328376622. Its totient is φ = 328376620.

The previous prime is 328376597. The next prime is 328376623. The reversal of 328376621 is 126673823.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175854121 + 152522500 = 13261^2 + 12350^2 .

It is an emirp because it is prime and its reverse (126673823) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-328376621 is a prime.

Together with 328376623, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_17702678 and since 328376621 and 17702678 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (328376623) 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, 164188310 + 164188311.

It is an arithmetic number, because the mean of its divisors is an integer number (164188311).

Almost surely, 2^328376621 is an apocalyptic number.

It is an amenable number.

328376621 is a deficient number, since it is larger than the sum of its proper divisors (1).

328376621 is an equidigital number, since it uses as much as digits as its factorization.

328376621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 38.

The square root of 328376621 is about 18121.1650011802. The cubic root of 328376621 is about 689.9073046380.

The spelling of 328376621 in words is "three hundred twenty-eight million, three hundred seventy-six thousand, six hundred twenty-one".