12187117 has 2 divisors, whose sum is σ = 12187118. Its totient is φ = 12187116.

The previous prime is 12187073. The next prime is 12187121. The reversal of 12187117 is 71178121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12187081 + 36 = 3491^2 + 6^2 .

It is a cyclic number.

It is not a de Polignac number, because 12187117 - 2¹⁵ = 12154349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12187817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6093558 + 6093559.

It is an arithmetic number, because the mean of its divisors is an integer number (6093559).

Almost surely, 2^12187117 is an apocalyptic number.

It is an amenable number.

12187117 is a deficient number, since it is larger than the sum of its proper divisors (1).

12187117 is an equidigital number, since it uses as much as digits as its factorization.

12187117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 784, while the sum is 28.

The square root of 12187117 is about 3491.0051561119. The cubic root of 12187117 is about 230.1266913861.

The spelling of 12187117 in words is "twelve million, one hundred eighty-seven thousand, one hundred seventeen".