8920321 has 2 divisors, whose sum is σ = 8920322. Its totient is φ = 8920320.

The previous prime is 8920279. The next prime is 8920337. The reversal of 8920321 is 1230298.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8850625 + 69696 = 2975^2 + 264^2 .

It is a cyclic number.

It is not a de Polignac number, because 8920321 - 2⁹ = 8919809 is a prime.

8920321 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (8920391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4460160 + 4460161.

It is an arithmetic number, because the mean of its divisors is an integer number (4460161).

Almost surely, 2^8920321 is an apocalyptic number.

It is an amenable number.

8920321 is a deficient number, since it is larger than the sum of its proper divisors (1).

8920321 is an equidigital number, since it uses as much as digits as its factorization.

8920321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 8920321 is about 2986.6906435049. The cubic root of 8920321 is about 207.3927136869.

The spelling of 8920321 in words is "eight million, nine hundred twenty thousand, three hundred twenty-one".