12126749 has 2 divisors, whose sum is σ = 12126750. Its totient is φ = 12126748.

The previous prime is 12126743. The next prime is 12126757. The reversal of 12126749 is 94762121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12040900 + 85849 = 3470^2 + 293^2 .

It is an emirp because it is prime and its reverse (94762121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12126749 - 2⁴ = 12126733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12126743) 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, 6063374 + 6063375.

It is an arithmetic number, because the mean of its divisors is an integer number (6063375).

Almost surely, 2^12126749 is an apocalyptic number.

It is an amenable number.

12126749 is a deficient number, since it is larger than the sum of its proper divisors (1).

12126749 is an equidigital number, since it uses as much as digits as its factorization.

12126749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 32.

The square root of 12126749 is about 3482.3482020039. The cubic root of 12126749 is about 229.7460903086.

The spelling of 12126749 in words is "twelve million, one hundred twenty-six thousand, seven hundred forty-nine".