12181165 has 4 divisors (see below), whose sum is σ = 14617404. Its totient is φ = 9744928.

The previous prime is 12181157. The next prime is 12181187. The reversal of 12181165 is 56118121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3437316 + 8743849 = 1854^2 + 2957^2 .

It is a cyclic number.

It is not a de Polignac number, because 12181165 - 2³ = 12181157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1218112 + ... + 1218121.

It is an arithmetic number, because the mean of its divisors is an integer number (3654351).

Almost surely, 2^12181165 is an apocalyptic number.

It is an amenable number.

12181165 is a deficient number, since it is larger than the sum of its proper divisors (2436239).

12181165 is an equidigital number, since it uses as much as digits as its factorization.

12181165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2436238.

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

The square root of 12181165 is about 3490.1525754614. The cubic root of 12181165 is about 230.0892218432.

Adding to 12181165 its reverse (56118121), we get a palindrome (68299286).

It can be divided in two parts, 1218116 and 5, that added together give a palindrome (1218121).

The spelling of 12181165 in words is "twelve million, one hundred eighty-one thousand, one hundred sixty-five".