22915209 has 4 divisors (see below), whose sum is σ = 30553616. Its totient is φ = 15276804.

The previous prime is 22915181. The next prime is 22915219. The reversal of 22915209 is 90251922.

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.

It is not a de Polignac number, because 22915209 - 2¹⁷ = 22784137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22915219) 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, 3819199 + ... + 3819204.

It is an arithmetic number, because the mean of its divisors is an integer number (7638404).

Almost surely, 2^22915209 is an apocalyptic number.

It is an amenable number.

22915209 is a deficient number, since it is larger than the sum of its proper divisors (7638407).

22915209 is an equidigital number, since it uses as much as digits as its factorization.

22915209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7638406.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 22915209 is about 4786.9832880427. The cubic root of 22915209 is about 284.0367976191.

The spelling of 22915209 in words is "twenty-two million, nine hundred fifteen thousand, two hundred nine".