328821001 has 2 divisors, whose sum is σ = 328821002. Its totient is φ = 328821000.

The previous prime is 328820971. The next prime is 328821007. The reversal of 328821001 is 100128823.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 261662976 + 67158025 = 16176^2 + 8195^2 .

It is an emirp because it is prime and its reverse (100128823) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 328821001 - 2⁵ = 328820969 is a prime.

It is not a weakly prime, because it can be changed into another prime (328821007) 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, 164410500 + 164410501.

It is an arithmetic number, because the mean of its divisors is an integer number (164410501).

Almost surely, 2^328821001 is an apocalyptic number.

It is an amenable number.

328821001 is a deficient number, since it is larger than the sum of its proper divisors (1).

328821001 is an equidigital number, since it uses as much as digits as its factorization.

328821001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 328821001 is about 18133.4222087283. The cubic root of 328821001 is about 690.2183730854.

Adding to 328821001 its reverse (100128823), we get a palindrome (428949824).

The spelling of 328821001 in words is "three hundred twenty-eight million, eight hundred twenty-one thousand, one".