22185557 has 2 divisors, whose sum is σ = 22185558. Its totient is φ = 22185556.

The previous prime is 22185529. The next prime is 22185577. The reversal of 22185557 is 75558122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17631601 + 4553956 = 4199^2 + 2134^2 .

It is a cyclic number.

It is not a de Polignac number, because 22185557 - 2²⁴ = 5408341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22185577) 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, 11092778 + 11092779.

It is an arithmetic number, because the mean of its divisors is an integer number (11092779).

Almost surely, 2^22185557 is an apocalyptic number.

It is an amenable number.

22185557 is a deficient number, since it is larger than the sum of its proper divisors (1).

22185557 is an equidigital number, since it uses as much as digits as its factorization.

22185557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28000, while the sum is 35.

The square root of 22185557 is about 4710.1546683734. The cubic root of 22185557 is about 280.9895134193.

The spelling of 22185557 in words is "twenty-two million, one hundred eighty-five thousand, five hundred fifty-seven".