12165181 has 16 divisors (see below), whose sum is σ = 14688000. Its totient is φ = 10059504.

The previous prime is 12165161. The next prime is 12165199. The reversal of 12165181 is 18156121.

It is a happy number.

12165181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12165181 - 2¹¹ = 12163133 is a prime.

It is a super-2 number, since 2×12165181² = 295983257525522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12165161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9336 + ... + 10558.

It is an arithmetic number, because the mean of its divisors is an integer number (918000).

Almost surely, 2^12165181 is an apocalyptic number.

It is an amenable number.

12165181 is a deficient number, since it is larger than the sum of its proper divisors (2522819).

12165181 is an equidigital number, since it uses as much as digits as its factorization.

12165181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273 (or 1259 counting only the distinct ones).

The product of its digits is 480, while the sum is 25.

The square root of 12165181 is about 3487.8619525434. The cubic root of 12165181 is about 229.9885375510.

The spelling of 12165181 in words is "twelve million, one hundred sixty-five thousand, one hundred eighty-one".