12108181 has 2 divisors, whose sum is σ = 12108182. Its totient is φ = 12108180.

The previous prime is 12108179. The next prime is 12108193. The reversal of 12108181 is 18180121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6081156 + 6027025 = 2466^2 + 2455^2 .

It is a cyclic number.

It is not a de Polignac number, because 12108181 - 2¹ = 12108179 is a prime.

It is a super-2 number, since 2×12108181² = 293216094257522, which contains 22 as substring.

Together with 12108179, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12108581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6054090 + 6054091.

It is an arithmetic number, because the mean of its divisors is an integer number (6054091).

Almost surely, 2^12108181 is an apocalyptic number.

It is an amenable number.

12108181 is a deficient number, since it is larger than the sum of its proper divisors (1).

12108181 is an equidigital number, since it uses as much as digits as its factorization.

12108181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 22.

The square root of 12108181 is about 3479.6811635551. The cubic root of 12108181 is about 229.6287710246.

The spelling of 12108181 in words is "twelve million, one hundred eight thousand, one hundred eighty-one".