12181529 has 2 divisors, whose sum is σ = 12181530. Its totient is φ = 12181528.

The previous prime is 12181523. The next prime is 12181531. The reversal of 12181529 is 92518121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11916304 + 265225 = 3452^2 + 515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12181529 is a prime.

Together with 12181531, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12181523) 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, 6090764 + 6090765.

It is an arithmetic number, because the mean of its divisors is an integer number (6090765).

Almost surely, 2^12181529 is an apocalyptic number.

It is an amenable number.

12181529 is a deficient number, since it is larger than the sum of its proper divisors (1).

12181529 is an equidigital number, since it uses as much as digits as its factorization.

12181529 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 29.

The square root of 12181529 is about 3490.2047217893. The cubic root of 12181529 is about 230.0915136777.

The spelling of 12181529 in words is "twelve million, one hundred eighty-one thousand, five hundred twenty-nine".