22189991 has 2 divisors, whose sum is σ = 22189992. Its totient is φ = 22189990.

The previous prime is 22189961. The next prime is 22189997. The reversal of 22189991 is 19998122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22189991 - 2⁶ = 22189927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22189997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11094995 + 11094996.

It is an arithmetic number, because the mean of its divisors is an integer number (11094996).

Almost surely, 2^22189991 is an apocalyptic number.

22189991 is a deficient number, since it is larger than the sum of its proper divisors (1).

22189991 is an equidigital number, since it uses as much as digits as its factorization.

22189991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 41.

The square root of 22189991 is about 4710.6253300385. The cubic root of 22189991 is about 281.0082316708.

The spelling of 22189991 in words is "twenty-two million, one hundred eighty-nine thousand, nine hundred ninety-one".