12136565 has 12 divisors (see below), whose sum is σ = 16941996. Its totient is φ = 8322048.

The previous prime is 12136561. The next prime is 12136577. The reversal of 12136565 is 56563121.

12136565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 4986289 + 7150276 = 2233^2 + 2674^2 .

It is not a de Polignac number, because 12136565 - 2² = 12136561 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 (12136561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24524 + ... + 25013.

It is an arithmetic number, because the mean of its divisors is an integer number (1411833).

Almost surely, 2^12136565 is an apocalyptic number.

It is an amenable number.

12136565 is a deficient number, since it is larger than the sum of its proper divisors (4805431).

12136565 is an equidigital number, since it uses as much as digits as its factorization.

12136565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49556 (or 49549 counting only the distinct ones).

The product of its digits is 5400, while the sum is 29.

The square root of 12136565 is about 3483.7573107207. The cubic root of 12136565 is about 229.8080629337.

Adding to 12136565 its reverse (56563121), we get a palindrome (68699686).

The spelling of 12136565 in words is "twelve million, one hundred thirty-six thousand, five hundred sixty-five".