845704561 has 9 divisors (see below), whose sum is σ = 916172481. Its totient is φ = 780301392.

The previous prime is 845704537. The next prime is 845704633. The reversal of 845704561 is 165407548.

The square root of 845704561 is 29081.

It is a perfect power (a square), and thus also a powerful number.

845704561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4704561 + 841000000 = 2169^2 + 29000^2 .

It is a de Polignac number, because none of the positive numbers 2^k-845704561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (845714561) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 376935 + ... + 379171.

Almost surely, 2^845704561 is an apocalyptic number.

845704561 is the 29081-st square number.

845704561 is the 14541-st centered octagonal number.

It is an amenable number.

845704561 is a deficient number, since it is larger than the sum of its proper divisors (70467920).

845704561 is an frugal number, since it uses more digits than its factorization.

845704561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4500 (or 2250 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 40.

The cubic root of 845704561 is about 945.6698817752.

The spelling of 845704561 in words is "eight hundred forty-five million, seven hundred four thousand, five hundred sixty-one".