12159809 has 2 divisors, whose sum is σ = 12159810. Its totient is φ = 12159808.

The previous prime is 12159757. The next prime is 12159827. The reversal of 12159809 is 90895121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11937025 + 222784 = 3455^2 + 472^2 .

It is an emirp because it is prime and its reverse (90895121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12159809 - 2¹⁶ = 12094273 is a prime.

It is not a weakly prime, because it can be changed into another prime (12159899) 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, 6079904 + 6079905.

It is an arithmetic number, because the mean of its divisors is an integer number (6079905).

Almost surely, 2^12159809 is an apocalyptic number.

It is an amenable number.

12159809 is a deficient number, since it is larger than the sum of its proper divisors (1).

12159809 is an equidigital number, since it uses as much as digits as its factorization.

12159809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 12159809 is about 3487.0917682218. The cubic root of 12159809 is about 229.9546791610.

The spelling of 12159809 in words is "twelve million, one hundred fifty-nine thousand, eight hundred nine".