12281729 has 2 divisors, whose sum is σ = 12281730. Its totient is φ = 12281728.

The previous prime is 12281719. The next prime is 12281767. The reversal of 12281729 is 92718221.

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., 8690704 + 3591025 = 2948^2 + 1895^2 .

It is a cyclic number.

It is not a de Polignac number, because 12281729 - 2⁴ = 12281713 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12281695 and 12281704.

It is not a weakly prime, because it can be changed into another prime (12281719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6140864 + 6140865.

It is an arithmetic number, because the mean of its divisors is an integer number (6140865).

Almost surely, 2^12281729 is an apocalyptic number.

It is an amenable number.

12281729 is a deficient number, since it is larger than the sum of its proper divisors (1).

12281729 is an equidigital number, since it uses as much as digits as its factorization.

12281729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 32.

The square root of 12281729 is about 3504.5297830094. The cubic root of 12281729 is about 230.7206695910.

It can be divided in two parts, 1228 and 1729, that multiplied together give a palindrome (2123212).

The spelling of 12281729 in words is "twelve million, two hundred eighty-one thousand, seven hundred twenty-nine".