12159181 has 2 divisors, whose sum is σ = 12159182. Its totient is φ = 12159180.

The previous prime is 12159163. The next prime is 12159187. The reversal of 12159181 is 18195121.

12159181 is digitally balanced in base 2, because in such base 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., 6937956 + 5221225 = 2634^2 + 2285^2 .

It is a cyclic number.

It is not a de Polignac number, because 12159181 - 2⁷ = 12159053 is a prime.

It is a super-2 number, since 2×12159181² = 295691365181522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12159187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6079590 + 6079591.

It is an arithmetic number, because the mean of its divisors is an integer number (6079591).

Almost surely, 2^12159181 is an apocalyptic number.

It is an amenable number.

12159181 is a deficient number, since it is larger than the sum of its proper divisors (1).

12159181 is an equidigital number, since it uses as much as digits as its factorization.

12159181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 28.

The square root of 12159181 is about 3487.0017206764. The cubic root of 12159181 is about 229.9507203810.

The spelling of 12159181 in words is "twelve million, one hundred fifty-nine thousand, one hundred eighty-one".