328285921 has 2 divisors, whose sum is σ = 328285922. Its totient is φ = 328285920.

The previous prime is 328285907. The next prime is 328285967. The reversal of 328285921 is 129582823.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 298909521 + 29376400 = 17289^2 + 5420^2 .

It is a cyclic number.

It is not a de Polignac number, because 328285921 - 2⁹ = 328285409 is a prime.

It is not a weakly prime, because it can be changed into another prime (328285121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164142960 + 164142961.

It is an arithmetic number, because the mean of its divisors is an integer number (164142961).

Almost surely, 2^328285921 is an apocalyptic number.

It is an amenable number.

328285921 is a deficient number, since it is larger than the sum of its proper divisors (1).

328285921 is an equidigital number, since it uses as much as digits as its factorization.

328285921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 40.

The square root of 328285921 is about 18118.6622298668. The cubic root of 328285921 is about 689.8437796583.

The spelling of 328285921 in words is "three hundred twenty-eight million, two hundred eighty-five thousand, nine hundred twenty-one".