22806561 has 4 divisors (see below), whose sum is σ = 30408752. Its totient is φ = 15204372.

The previous prime is 22806551. The next prime is 22806577. The reversal of 22806561 is 16560822.

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 not a de Polignac number, because 22806561 - 2⁵ = 22806529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22806521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3801091 + ... + 3801096.

It is an arithmetic number, because the mean of its divisors is an integer number (7602188).

Almost surely, 2^22806561 is an apocalyptic number.

It is an amenable number.

22806561 is a deficient number, since it is larger than the sum of its proper divisors (7602191).

22806561 is an equidigital number, since it uses as much as digits as its factorization.

22806561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7602190.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 22806561 is about 4775.6215302304. The cubic root of 22806561 is about 283.5871845675.

The spelling of 22806561 in words is "twenty-two million, eight hundred six thousand, five hundred sixty-one".