12112181 has 2 divisors, whose sum is σ = 12112182. Its totient is φ = 12112180.

The previous prime is 12112159. The next prime is 12112183. The reversal of 12112181 is 18121121.

12112181 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9205156 + 2907025 = 3034^2 + 1705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12112181 is a prime.

It is a super-2 number, since 2×12112181² = 293409857153522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 12112183, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12112183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6056090 + 6056091.

It is an arithmetic number, because the mean of its divisors is an integer number (6056091).

Almost surely, 2^12112181 is an apocalyptic number.

It is an amenable number.

12112181 is a deficient number, since it is larger than the sum of its proper divisors (1).

12112181 is an equidigital number, since it uses as much as digits as its factorization.

12112181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32, while the sum is 17.

The square root of 12112181 is about 3480.2558813972. The cubic root of 12112181 is about 229.6540545900.

The spelling of 12112181 in words is "twelve million, one hundred twelve thousand, one hundred eighty-one".