845599561 has 2 divisors, whose sum is σ = 845599562. Its totient is φ = 845599560.

The previous prime is 845599553. The next prime is 845599571. The reversal of 845599561 is 165995548.

845599561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 704583936 + 141015625 = 26544^2 + 11875^2 .

It is a cyclic number.

It is not a de Polignac number, because 845599561 - 2³ = 845599553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 845599499 and 845599508.

It is not a weakly prime, because it can be changed into another prime (845599571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422799780 + 422799781.

It is an arithmetic number, because the mean of its divisors is an integer number (422799781).

Almost surely, 2^845599561 is an apocalyptic number.

It is an amenable number.

845599561 is a deficient number, since it is larger than the sum of its proper divisors (1).

845599561 is an equidigital number, since it uses as much as digits as its factorization.

845599561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944000, while the sum is 52.

The square root of 845599561 is about 29079.1946415302. The cubic root of 845599561 is about 945.6307430295.

The spelling of 845599561 in words is "eight hundred forty-five million, five hundred ninety-nine thousand, five hundred sixty-one".