22525209 has 20 divisors (see below), whose sum is σ = 38456704. Its totient is φ = 12871224.

The previous prime is 22525207. The next prime is 22525219. The reversal of 22525209 is 90252522.

It is not a de Polignac number, because 22525209 - 2¹ = 22525207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22525201) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 19297 + ... + 20430.

Almost surely, 2^22525209 is an apocalyptic number.

It is an amenable number.

22525209 is a deficient number, since it is larger than the sum of its proper divisors (15931495).

22525209 is an equidigital number, since it uses as much as digits as its factorization.

22525209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39746 (or 39737 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 22525209 is about 4746.0730082880. The cubic root of 22525209 is about 282.4162029895.

The spelling of 22525209 in words is "twenty-two million, five hundred twenty-five thousand, two hundred nine".