22543165 has 4 divisors (see below), whose sum is σ = 27051804. Its totient is φ = 18034528.

The previous prime is 22543141. The next prime is 22543181. The reversal of 22543165 is 56134522.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14092516 + 8450649 = 3754^2 + 2907^2 .

It is a cyclic number.

It is not a de Polignac number, because 22543165 - 2¹¹ = 22541117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2254312 + ... + 2254321.

It is an arithmetic number, because the mean of its divisors is an integer number (6762951).

Almost surely, 2^22543165 is an apocalyptic number.

It is an amenable number.

22543165 is a deficient number, since it is larger than the sum of its proper divisors (4508639).

22543165 is an equidigital number, since it uses as much as digits as its factorization.

22543165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4508638.

The product of its digits is 7200, while the sum is 28.

The square root of 22543165 is about 4747.9643006240. The cubic root of 22543165 is about 282.4912258741.

Adding to 22543165 its reverse (56134522), we get a palindrome (78677687).

The spelling of 22543165 in words is "twenty-two million, five hundred forty-three thousand, one hundred sixty-five".