12565165 has 4 divisors (see below), whose sum is σ = 15078204. Its totient is φ = 10052128.

The previous prime is 12565139. The next prime is 12565169. The reversal of 12565165 is 56156521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56156521 = 53 ⋅1059557.

It can be written as a sum of positive squares in 2 ways, for example, as 7733961 + 4831204 = 2781^2 + 2198^2 .

It is a cyclic number.

It is not a de Polignac number, because 12565165 - 2¹⁵ = 12532397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12565169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1256512 + ... + 1256521.

It is an arithmetic number, because the mean of its divisors is an integer number (3769551).

Almost surely, 2^12565165 is an apocalyptic number.

It is an amenable number.

12565165 is a deficient number, since it is larger than the sum of its proper divisors (2513039).

12565165 is an equidigital number, since it uses as much as digits as its factorization.

12565165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2513038.

The product of its digits is 9000, while the sum is 31.

The square root of 12565165 is about 3544.7376489664. The cubic root of 12565165 is about 232.4820350708.

It can be divided in two parts, 1256516 and 5, that added together give a palindrome (1256521).

The spelling of 12565165 in words is "twelve million, five hundred sixty-five thousand, one hundred sixty-five".