22055591 has 2 divisors, whose sum is σ = 22055592.
Its totient is φ = 22055590.
The previous prime is 22055567. The next prime is 22055609. The reversal of 22055591 is 19555022.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 22055591 - 210 = 22054567 is a prime.
It is a Sophie Germain prime.
It is a Chen prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (22055521) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11027795 + 11027796.
It is an arithmetic number, because the mean of its divisors is an integer number (11027796).
Almost surely, 222055591 is an apocalyptic number.
22055591 is a deficient number, since it is larger than the sum of its proper divisors (1).
22055591 is an equidigital number, since it uses as much as digits as its factorization.
22055591 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 4500, while the sum is 29.
The square root of 22055591 is about 4696.3380414957.
The cubic root of 22055591 is about 280.4397469302.
The spelling of 22055591 in words is "twenty-two million, fifty-five thousand, five hundred ninety-one".