22368509 has 4 divisors (see below), whose sum is σ = 22455804. Its totient is φ = 22281216.

The previous prime is 22368503. The next prime is 22368539. The reversal of 22368509 is 90586322.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90586322 = 2 ⋅45293161.

It can be written as a sum of positive squares in 2 ways, for example, as 12096484 + 10272025 = 3478^2 + 3205^2 .

It is a cyclic number.

It is not a de Polignac number, because 22368509 - 2⁸ = 22368253 is a prime.

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 (22368503) 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, 43262 + ... + 43775.

It is an arithmetic number, because the mean of its divisors is an integer number (5613951).

Almost surely, 2^22368509 is an apocalyptic number.

It is an amenable number.

22368509 is a deficient number, since it is larger than the sum of its proper divisors (87295).

22368509 is an equidigital number, since it uses as much as digits as its factorization.

22368509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87294.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 22368509 is about 4729.5358123182. The cubic root of 22368509 is about 281.7597882326.

The spelling of 22368509 in words is "twenty-two million, three hundred sixty-eight thousand, five hundred nine".