22544561 has 4 divisors (see below), whose sum is σ = 24278772. Its totient is φ = 20810352.

The previous prime is 22544551. The next prime is 22544573. The reversal of 22544561 is 16544522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16544522 = 2 ⋅8272261.

It can be written as a sum of positive squares in 2 ways, for example, as 12816400 + 9728161 = 3580^2 + 3119^2 .

It is a cyclic number.

It is not a de Polignac number, because 22544561 - 2⁶ = 22544497 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 (22544551) 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, 867086 + ... + 867111.

It is an arithmetic number, because the mean of its divisors is an integer number (6069693).

Almost surely, 2^22544561 is an apocalyptic number.

It is an amenable number.

22544561 is a deficient number, since it is larger than the sum of its proper divisors (1734211).

22544561 is a wasteful number, since it uses less digits than its factorization.

22544561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1734210.

The product of its digits is 9600, while the sum is 29.

The square root of 22544561 is about 4748.1113087206. Note that the first 3 decimals coincide. The cubic root of 22544561 is about 282.4970569041.

The spelling of 22544561 in words is "twenty-two million, five hundred forty-four thousand, five hundred sixty-one".