12328181 has 2 divisors, whose sum is σ = 12328182. Its totient is φ = 12328180.

The previous prime is 12328177. The next prime is 12328189. The reversal of 12328181 is 18182321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9796900 + 2531281 = 3130^2 + 1591^2 .

It is a cyclic number.

It is not a de Polignac number, because 12328181 - 2² = 12328177 is a prime.

It is a super-2 number, since 2×12328181² = 303968093537522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12328181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12328189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6164090 + 6164091.

It is an arithmetic number, because the mean of its divisors is an integer number (6164091).

Almost surely, 2^12328181 is an apocalyptic number.

It is an amenable number.

12328181 is a deficient number, since it is larger than the sum of its proper divisors (1).

12328181 is an equidigital number, since it uses as much as digits as its factorization.

12328181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 26.

The square root of 12328181 is about 3511.1509508991. The cubic root of 12328181 is about 231.0111811583.

The spelling of 12328181 in words is "twelve million, three hundred twenty-eight thousand, one hundred eighty-one".