22509899 has 4 divisors (see below), whose sum is σ = 22535520. Its totient is φ = 22484280.

The previous prime is 22509881. The next prime is 22509919. The reversal of 22509899 is 99890522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99890522 = 2 ⋅49945261.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22509899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22509199) 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, 11444 + ... + 13265.

It is an arithmetic number, because the mean of its divisors is an integer number (5633880).

Almost surely, 2^22509899 is an apocalyptic number.

22509899 is a deficient number, since it is larger than the sum of its proper divisors (25621).

22509899 is an equidigital number, since it uses as much as digits as its factorization.

22509899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25620.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 22509899 is about 4744.4598217289. The cubic root of 22509899 is about 282.3522039971.

The spelling of 22509899 in words is "twenty-two million, five hundred nine thousand, eight hundred ninety-nine".