12128009 has 2 divisors, whose sum is σ = 12128010. Its totient is φ = 12128008.

The previous prime is 12127993. The next prime is 12128027. The reversal of 12128009 is 90082121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11580409 + 547600 = 3403^2 + 740^2 .

It is an emirp because it is prime and its reverse (90082121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12128009 - 2⁴ = 12127993 is a prime.

It is not a weakly prime, because it can be changed into another prime (12128059) 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, 6064004 + 6064005.

It is an arithmetic number, because the mean of its divisors is an integer number (6064005).

Almost surely, 2^12128009 is an apocalyptic number.

It is an amenable number.

12128009 is a deficient number, since it is larger than the sum of its proper divisors (1).

12128009 is an equidigital number, since it uses as much as digits as its factorization.

12128009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 12128009 is about 3482.5291097132. The cubic root of 12128009 is about 229.7540471004.

The spelling of 12128009 in words is "twelve million, one hundred twenty-eight thousand, nine".