9008561 has 4 divisors (see below), whose sum is σ = 9228324. Its totient is φ = 8788800.

The previous prime is 9008557. The next prime is 9008581. The reversal of 9008561 is 1658009.

9008561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1168561 + 7840000 = 1081^2 + 2800^2 .

It is a cyclic number.

It is not a de Polignac number, because 9008561 - 2² = 9008557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9008581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109820 + ... + 109901.

It is an arithmetic number, because the mean of its divisors is an integer number (2307081).

Almost surely, 2^9008561 is an apocalyptic number.

It is an amenable number.

9008561 is a deficient number, since it is larger than the sum of its proper divisors (219763).

9008561 is a wasteful number, since it uses less digits than its factorization.

9008561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219762.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 9008561 is about 3001.4264941857. The cubic root of 9008561 is about 208.0743154691.

The spelling of 9008561 in words is "nine million, eight thousand, five hundred sixty-one".