12132181 has 4 divisors (see below), whose sum is σ = 12182764. Its totient is φ = 12081600.

The previous prime is 12132151. The next prime is 12132217. The reversal of 12132181 is 18123121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18123121 = 389 ⋅46589.

It can be written as a sum of positive squares in 2 ways, for example, as 8031556 + 4100625 = 2834^2 + 2025^2 .

It is a cyclic number.

It is not a de Polignac number, because 12132181 - 2⁷ = 12132053 is a prime.

It is a super-2 number, since 2×12132181² = 294379631633522, 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 (12132151) 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, 24930 + ... + 25411.

It is an arithmetic number, because the mean of its divisors is an integer number (3045691).

Almost surely, 2^12132181 is an apocalyptic number.

It is an amenable number.

12132181 is a deficient number, since it is larger than the sum of its proper divisors (50583).

12132181 is an equidigital number, since it uses as much as digits as its factorization.

12132181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50582.

The product of its digits is 96, while the sum is 19.

The square root of 12132181 is about 3483.1280481774. The cubic root of 12132181 is about 229.7803889892.

The spelling of 12132181 in words is "twelve million, one hundred thirty-two thousand, one hundred eighty-one".