12181441 has 4 divisors (see below), whose sum is σ = 12196800. Its totient is φ = 12166084.

The previous prime is 12181423. The next prime is 12181447. The reversal of 12181441 is 14418121.

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 an emirpimes, since its reverse is a distinct semiprime: 14418121 = 2621 ⋅5501.

It is a cyclic number.

It is not a de Polignac number, because 12181441 - 2⁵ = 12181409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12181447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6421 + ... + 8098.

It is an arithmetic number, because the mean of its divisors is an integer number (3049200).

Almost surely, 2^12181441 is an apocalyptic number.

It is an amenable number.

12181441 is a deficient number, since it is larger than the sum of its proper divisors (15359).

12181441 is an equidigital number, since it uses as much as digits as its factorization.

12181441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15358.

The product of its digits is 256, while the sum is 22.

The square root of 12181441 is about 3490.1921150561. The cubic root of 12181441 is about 230.0909596120.

Adding to 12181441 its reverse (14418121), we get a palindrome (26599562).

The spelling of 12181441 in words is "twelve million, one hundred eighty-one thousand, four hundred forty-one".