845008321 has 2 divisors, whose sum is σ = 845008322. Its totient is φ = 845008320.

The previous prime is 845008303. The next prime is 845008357. The reversal of 845008321 is 123800548.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 828288400 + 16719921 = 28780^2 + 4089^2 .

It is a cyclic number.

It is not a de Polignac number, because 845008321 - 2⁵ = 845008289 is a prime.

It is not a weakly prime, because it can be changed into another prime (845008121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422504160 + 422504161.

It is an arithmetic number, because the mean of its divisors is an integer number (422504161).

Almost surely, 2^845008321 is an apocalyptic number.

It is an amenable number.

845008321 is a deficient number, since it is larger than the sum of its proper divisors (1).

845008321 is an equidigital number, since it uses as much as digits as its factorization.

845008321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 845008321 is about 29069.0268326960. The cubic root of 845008321 is about 945.4102978359.

Adding to 845008321 its reverse (123800548), we get a palindrome (968808869).

The spelling of 845008321 in words is "eight hundred forty-five million, eight thousand, three hundred twenty-one".