12126181 has 4 divisors (see below), whose sum is σ = 12133152. Its totient is φ = 12119212.

The previous prime is 12126173. The next prime is 12126187. The reversal of 12126181 is 18162121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12126181 - 2³ = 12126173 is a prime.

It is a super-2 number, since 2×12126181² = 294088531289522, 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 (12126187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1536 + ... + 5158.

It is an arithmetic number, because the mean of its divisors is an integer number (3033288).

Almost surely, 2^12126181 is an apocalyptic number.

It is an amenable number.

12126181 is a deficient number, since it is larger than the sum of its proper divisors (6971).

12126181 is an equidigital number, since it uses as much as digits as its factorization.

12126181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6970.

The product of its digits is 192, while the sum is 22.

The square root of 12126181 is about 3482.2666468839. The cubic root of 12126181 is about 229.7425032572.

The spelling of 12126181 in words is "twelve million, one hundred twenty-six thousand, one hundred eighty-one".