22531165 has 4 divisors (see below), whose sum is σ = 27037404. Its totient is φ = 18024928.

The previous prime is 22531153. The next prime is 22531177. The reversal of 22531165 is 56113522.

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

It is an interprime number because it is at equal distance from previous prime (22531153) and next prime (22531177).

It can be written as a sum of positive squares in 2 ways, for example, as 9721924 + 12809241 = 3118^2 + 3579^2 .

It is a cyclic number.

It is not a de Polignac number, because 22531165 - 2⁹ = 22530653 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, 2253112 + ... + 2253121.

It is an arithmetic number, because the mean of its divisors is an integer number (6759351).

Almost surely, 2^22531165 is an apocalyptic number.

It is an amenable number.

22531165 is a deficient number, since it is larger than the sum of its proper divisors (4506239).

22531165 is an equidigital number, since it uses as much as digits as its factorization.

22531165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4506238.

The product of its digits is 1800, while the sum is 25.

The square root of 22531165 is about 4746.7004329323. The cubic root of 22531165 is about 282.4410924762.

Adding to 22531165 its reverse (56113522), we get a palindrome (78644687).

The spelling of 22531165 in words is "twenty-two million, five hundred thirty-one thousand, one hundred sixty-five".