22198591 has 2 divisors, whose sum is σ = 22198592. Its totient is φ = 22198590.

The previous prime is 22198513. The next prime is 22198607. The reversal of 22198591 is 19589122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22198591 - 2¹⁵ = 22165823 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22198591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22198391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11099295 + 11099296.

It is an arithmetic number, because the mean of its divisors is an integer number (11099296).

Almost surely, 2^22198591 is an apocalyptic number.

22198591 is a deficient number, since it is larger than the sum of its proper divisors (1).

22198591 is an equidigital number, since it uses as much as digits as its factorization.

22198591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 37.

The square root of 22198591 is about 4711.5380715855. The cubic root of 22198591 is about 281.0445296975.

The spelling of 22198591 in words is "twenty-two million, one hundred ninety-eight thousand, five hundred ninety-one".