845259971321 has 2 divisors, whose sum is σ = 845259971322. Its totient is φ = 845259971320.

The previous prime is 845259971291. The next prime is 845259971371. The reversal of 845259971321 is 123179952548.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 656730331321 + 188529640000 = 810389^2 + 434200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-845259971321 is a prime.

It is not a weakly prime, because it can be changed into another prime (845259971371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422629985660 + 422629985661.

It is an arithmetic number, because the mean of its divisors is an integer number (422629985661).

Almost surely, 2^845259971321 is an apocalyptic number.

It is an amenable number.

845259971321 is a deficient number, since it is larger than the sum of its proper divisors (1).

845259971321 is an equidigital number, since it uses as much as digits as its factorization.

845259971321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5443200, while the sum is 56.

The spelling of 845259971321 in words is "eight hundred forty-five billion, two hundred fifty-nine million, nine hundred seventy-one thousand, three hundred twenty-one".