22199561 has 2 divisors, whose sum is σ = 22199562. Its totient is φ = 22199560.

The previous prime is 22199509. The next prime is 22199563. The reversal of 22199561 is 16599122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22090000 + 109561 = 4700^2 + 331^2 .

It is a cyclic number.

It is not a de Polignac number, because 22199561 - 2¹⁸ = 21937417 is a prime.

Together with 22199563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22199563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11099780 + 11099781.

It is an arithmetic number, because the mean of its divisors is an integer number (11099781).

Almost surely, 2^22199561 is an apocalyptic number.

It is an amenable number.

22199561 is a deficient number, since it is larger than the sum of its proper divisors (1).

22199561 is an equidigital number, since it uses as much as digits as its factorization.

22199561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 35.

The square root of 22199561 is about 4711.6410092451. The cubic root of 22199561 is about 281.0486231889.

The spelling of 22199561 in words is "twenty-two million, one hundred ninety-nine thousand, five hundred sixty-one".