11561165 has 16 divisors (see below), whose sum is σ = 17297280. Its totient is φ = 7206720.

The previous prime is 11561161. The next prime is 11561197. The reversal of 11561165 is 56116511.

It is not a de Polignac number, because 11561165 - 2² = 11561161 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11561161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14630 + ... + 15399.

It is an arithmetic number, because the mean of its divisors is an integer number (1081080).

Almost surely, 2^11561165 is an apocalyptic number.

It is an amenable number.

11561165 is a deficient number, since it is larger than the sum of its proper divisors (5736115).

11561165 is a wasteful number, since it uses less digits than its factorization.

11561165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30052.

The product of its digits is 900, while the sum is 26.

The square root of 11561165 is about 3400.1713192132. The cubic root of 11561165 is about 226.1173392809.

Adding to 11561165 its reverse (56116511), we get a palindrome (67677676).

The spelling of 11561165 in words is "eleven million, five hundred sixty-one thousand, one hundred sixty-five".