12181447 has 2 divisors, whose sum is σ = 12181448. Its totient is φ = 12181446.

The previous prime is 12181423. The next prime is 12181457. The reversal of 12181447 is 74418121.

It is a strong prime.

It is an emirp because it is prime and its reverse (74418121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12181447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12181417) 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, 6090723 + 6090724.

It is an arithmetic number, because the mean of its divisors is an integer number (6090724).

Almost surely, 2^12181447 is an apocalyptic number.

12181447 is a deficient number, since it is larger than the sum of its proper divisors (1).

12181447 is an equidigital number, since it uses as much as digits as its factorization.

12181447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1792, while the sum is 28.

The square root of 12181447 is about 3490.1929746076. The cubic root of 12181447 is about 230.0909973893.

Adding to 12181447 its reverse (74418121), we get a palindrome (86599568).

The spelling of 12181447 in words is "twelve million, one hundred eighty-one thousand, four hundred forty-seven".