22185997 has 2 divisors, whose sum is σ = 22185998. Its totient is φ = 22185996.

The previous prime is 22185973. The next prime is 22186001. The reversal of 22185997 is 79958122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14182756 + 8003241 = 3766^2 + 2829^2 .

It is a cyclic number.

It is not a de Polignac number, because 22185997 - 2¹¹ = 22183949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22185907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11092998 + 11092999.

It is an arithmetic number, because the mean of its divisors is an integer number (11092999).

Almost surely, 2^22185997 is an apocalyptic number.

It is an amenable number.

22185997 is a deficient number, since it is larger than the sum of its proper divisors (1).

22185997 is an equidigital number, since it uses as much as digits as its factorization.

22185997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 43.

The square root of 22185997 is about 4710.2013757376. The cubic root of 22185997 is about 280.9913710027.

The spelling of 22185997 in words is "twenty-two million, one hundred eighty-five thousand, nine hundred ninety-seven".