12187181 has 8 divisors (see below), whose sum is σ = 13024440. Its totient is φ = 11363328.

The previous prime is 12187121. The next prime is 12187183. The reversal of 12187181 is 18178121.

12187181 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 4 ways, for example, as 8462281 + 3724900 = 2909^2 + 1930^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12187181 - 2⁶ = 12187117 is a prime.

It is a super-2 number, since 2×12187181² = 297054761453522, 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 (12187183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1436 + ... + 5141.

It is an arithmetic number, because the mean of its divisors is an integer number (1628055).

Almost surely, 2^12187181 is an apocalyptic number.

It is an amenable number.

12187181 is a deficient number, since it is larger than the sum of its proper divisors (837259).

12187181 is a wasteful number, since it uses less digits than its factorization.

12187181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6703.

The product of its digits is 896, while the sum is 29.

The square root of 12187181 is about 3491.0143225143. The cubic root of 12187181 is about 230.1270942181.

The spelling of 12187181 in words is "twelve million, one hundred eighty-seven thousand, one hundred eighty-one".