22504561 has 4 divisors (see below), whose sum is σ = 22714992. Its totient is φ = 22294132.

The previous prime is 22504541. The next prime is 22504577. The reversal of 22504561 is 16540522.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22504561 - 2⁵ = 22504529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22504541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105055 + ... + 105268.

It is an arithmetic number, because the mean of its divisors is an integer number (5678748).

Almost surely, 2^22504561 is an apocalyptic number.

It is an amenable number.

22504561 is a deficient number, since it is larger than the sum of its proper divisors (210431).

22504561 is a wasteful number, since it uses less digits than its factorization.

22504561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210430.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 22504561 is about 4743.8972375042. The cubic root of 22504561 is about 282.3298832214.

The spelling of 22504561 in words is "twenty-two million, five hundred four thousand, five hundred sixty-one".