22561181 has 2 divisors, whose sum is σ = 22561182. Its totient is φ = 22561180.

The previous prime is 22561177. The next prime is 22561219. The reversal of 22561181 is 18116522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22477081 + 84100 = 4741^2 + 290^2 .

It is a cyclic number.

It is not a de Polignac number, because 22561181 - 2² = 22561177 is a prime.

It is a super-2 number, since 2×22561181² = 1018013776229522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22561181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22561141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11280590 + 11280591.

It is an arithmetic number, because the mean of its divisors is an integer number (11280591).

Almost surely, 2^22561181 is an apocalyptic number.

It is an amenable number.

22561181 is a deficient number, since it is larger than the sum of its proper divisors (1).

22561181 is an equidigital number, since it uses as much as digits as its factorization.

22561181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 26.

The square root of 22561181 is about 4749.8611558655. The cubic root of 22561181 is about 282.5664594207.

The spelling of 22561181 in words is "twenty-two million, five hundred sixty-one thousand, one hundred eighty-one".