22189961 has 2 divisors, whose sum is σ = 22189962. Its totient is φ = 22189960.

The previous prime is 22189957. The next prime is 22189991. The reversal of 22189961 is 16998122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12924025 + 9265936 = 3595^2 + 3044^2 .

It is a cyclic number.

It is not a de Polignac number, because 22189961 - 2² = 22189957 is a prime.

It is not a weakly prime, because it can be changed into another prime (22189991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11094980 + 11094981.

It is an arithmetic number, because the mean of its divisors is an integer number (11094981).

Almost surely, 2^22189961 is an apocalyptic number.

It is an amenable number.

22189961 is a deficient number, since it is larger than the sum of its proper divisors (1).

22189961 is an equidigital number, since it uses as much as digits as its factorization.

22189961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 38.

The square root of 22189961 is about 4710.6221457468. The cubic root of 22189961 is about 281.0081050334.

The spelling of 22189961 in words is "twenty-two million, one hundred eighty-nine thousand, nine hundred sixty-one".