22185209 has 4 divisors (see below), whose sum is σ = 22194816. Its totient is φ = 22175604.

The previous prime is 22185197. The next prime is 22185227. The reversal of 22185209 is 90258122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 22185209 - 2⁴ = 22185193 is a prime.

It is a super-3 number, since 3×22185209³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22185109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 992 + ... + 6734.

It is an arithmetic number, because the mean of its divisors is an integer number (5548704).

Almost surely, 2^22185209 is an apocalyptic number.

It is an amenable number.

22185209 is a deficient number, since it is larger than the sum of its proper divisors (9607).

22185209 is an equidigital number, since it uses as much as digits as its factorization.

22185209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9606.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 22185209 is about 4710.1177267665. The cubic root of 22185209 is about 280.9880442223.

The spelling of 22185209 in words is "twenty-two million, one hundred eighty-five thousand, two hundred nine".