12124781 has 2 divisors, whose sum is σ = 12124782. Its totient is φ = 12124780.

The previous prime is 12124771. The next prime is 12124829. The reversal of 12124781 is 18742121.

12124781 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11055625 + 1069156 = 3325^2 + 1034^2 .

It is an emirp because it is prime and its reverse (18742121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12124781 - 2¹⁰ = 12123757 is a prime.

It is a super-2 number, since 2×12124781² = 294020628595922, 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 12124781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12124711) 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, 6062390 + 6062391.

It is an arithmetic number, because the mean of its divisors is an integer number (6062391).

Almost surely, 2^12124781 is an apocalyptic number.

It is an amenable number.

12124781 is a deficient number, since it is larger than the sum of its proper divisors (1).

12124781 is an equidigital number, since it uses as much as digits as its factorization.

12124781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 896, while the sum is 26.

The square root of 12124781 is about 3482.0656225867. The cubic root of 12124781 is about 229.7336614550.

The spelling of 12124781 in words is "twelve million, one hundred twenty-four thousand, seven hundred eighty-one".