845844561 has 12 divisors (see below), whose sum is σ = 1222427700. Its totient is φ = 563595360.

The previous prime is 845844539. The next prime is 845844667. The reversal of 845844561 is 165448548.

It is a happy number.

845844561 is a `hidden beast` number, since 8 + 4 + 5 + 84 + 4 + 561 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 315417600 + 530426961 = 17760^2 + 23031^2 .

It is not a de Polignac number, because 845844561 - 2⁶ = 845844497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (845844521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6570 + ... + 41651.

It is an arithmetic number, because the mean of its divisors is an integer number (101868975).

Almost surely, 2^845844561 is an apocalyptic number.

It is an amenable number.

845844561 is a deficient number, since it is larger than the sum of its proper divisors (376583139).

845844561 is a wasteful number, since it uses less digits than its factorization.

845844561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50176 (or 50173 counting only the distinct ones).

The product of its digits is 614400, while the sum is 45.

The square root of 845844561 is about 29083.4069702984. The cubic root of 845844561 is about 945.7220617305.

The spelling of 845844561 in words is "eight hundred forty-five million, eight hundred forty-four thousand, five hundred sixty-one".