22165209 has 24 divisors (see below), whose sum is σ = 35416992. Its totient is φ = 13245120.

The previous prime is 22165201. The next prime is 22165211. The reversal of 22165209 is 90256122.

22165209 is a `hidden beast` number, since 2 + 2 + 1 + 652 + 0 + 9 = 666.

It is not a de Polignac number, because 22165209 - 2³ = 22165201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22165201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5694 + ... + 8760.

It is an arithmetic number, because the mean of its divisors is an integer number (1475708).

Almost surely, 2^22165209 is an apocalyptic number.

It is an amenable number.

22165209 is a deficient number, since it is larger than the sum of its proper divisors (13251783).

22165209 is a wasteful number, since it uses less digits than its factorization.

22165209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3157 (or 3154 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 22165209 is about 4707.9941588749. The cubic root of 22165209 is about 280.9035817850.

The spelling of 22165209 in words is "twenty-two million, one hundred sixty-five thousand, two hundred nine".