22543265 has 4 divisors (see below), whose sum is σ = 27051924. Its totient is φ = 18034608.

The previous prime is 22543259. The next prime is 22543267. The reversal of 22543265 is 56234522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56234522 = 2 ⋅28117261.

It can be written as a sum of positive squares in 2 ways, for example, as 6615184 + 15928081 = 2572^2 + 3991^2 .

It is a cyclic number.

It is not a de Polignac number, because 22543265 - 2¹² = 22539169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22543267) 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, 2254322 + ... + 2254331.

It is an arithmetic number, because the mean of its divisors is an integer number (6762981).

Almost surely, 2^22543265 is an apocalyptic number.

It is an amenable number.

22543265 is a deficient number, since it is larger than the sum of its proper divisors (4508659).

22543265 is an equidigital number, since it uses as much as digits as its factorization.

22543265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4508658.

The product of its digits is 14400, while the sum is 29.

The square root of 22543265 is about 4747.9748314413. The cubic root of 22543265 is about 282.4916435777.

Adding to 22543265 its reverse (56234522), we get a palindrome (78777787).

The spelling of 22543265 in words is "twenty-two million, five hundred forty-three thousand, two hundred sixty-five".