22519561 has 2 divisors, whose sum is σ = 22519562. Its totient is φ = 22519560.

The previous prime is 22519559. The next prime is 22519597. The reversal of 22519561 is 16591522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14288400 + 8231161 = 3780^2 + 2869^2 .

It is a cyclic number.

It is not a de Polignac number, because 22519561 - 2¹ = 22519559 is a prime.

Together with 22519559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (22519531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11259780 + 11259781.

It is an arithmetic number, because the mean of its divisors is an integer number (11259781).

Almost surely, 2^22519561 is an apocalyptic number.

It is an amenable number.

22519561 is a deficient number, since it is larger than the sum of its proper divisors (1).

22519561 is an equidigital number, since it uses as much as digits as its factorization.

22519561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 31.

The square root of 22519561 is about 4745.4779527462. The cubic root of 22519561 is about 282.3925965485.

The spelling of 22519561 in words is "twenty-two million, five hundred nineteen thousand, five hundred sixty-one".