328891817 has 2 divisors, whose sum is σ = 328891818. Its totient is φ = 328891816.

The previous prime is 328891807. The next prime is 328891891. The reversal of 328891817 is 718198823.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 316982416 + 11909401 = 17804^2 + 3451^2 .

It is a cyclic number.

It is not a de Polignac number, because 328891817 - 2⁸ = 328891561 is a prime.

It is a super-2 number, since 2×328891817² = 216339654579122978, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (328891807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164445908 + 164445909.

It is an arithmetic number, because the mean of its divisors is an integer number (164445909).

Almost surely, 2^328891817 is an apocalyptic number.

It is an amenable number.

328891817 is a deficient number, since it is larger than the sum of its proper divisors (1).

328891817 is an equidigital number, since it uses as much as digits as its factorization.

328891817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 47.

The square root of 328891817 is about 18135.3747410965. The cubic root of 328891817 is about 690.2679187812.

The spelling of 328891817 in words is "three hundred twenty-eight million, eight hundred ninety-one thousand, eight hundred seventeen".