12561165 has 12 divisors (see below), whose sum is σ = 21772764. Its totient is φ = 6699264.

The previous prime is 12561163. The next prime is 12561187. The reversal of 12561165 is 56116521.

It is a happy number.

12561165 is digitally balanced in base 3, 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 1887876 + 10673289 = 1374^2 + 3267^2 .

It is not a de Polignac number, because 12561165 - 2¹ = 12561163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12561163) 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, 139524 + ... + 139613.

It is an arithmetic number, because the mean of its divisors is an integer number (1814397).

Almost surely, 2^12561165 is an apocalyptic number.

12561165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12561165 is a deficient number, since it is larger than the sum of its proper divisors (9211599).

12561165 is a wasteful number, since it uses less digits than its factorization.

12561165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279148 (or 279145 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 12561165 is about 3544.1733874064. The cubic root of 12561165 is about 232.4573629758.

Adding to 12561165 its reverse (56116521), we get a palindrome (68677686).

The spelling of 12561165 in words is "twelve million, five hundred sixty-one thousand, one hundred sixty-five".