12136809 has 4 divisors (see below), whose sum is σ = 16182416. Its totient is φ = 8091204.

The previous prime is 12136783. The next prime is 12136829. The reversal of 12136809 is 90863121.

12136809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12136809 - 2¹³ = 12128617 is a prime.

It is a super-3 number, since 3×12136809³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12136829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2022799 + ... + 2022804.

It is an arithmetic number, because the mean of its divisors is an integer number (4045604).

Almost surely, 2^12136809 is an apocalyptic number.

It is an amenable number.

12136809 is a deficient number, since it is larger than the sum of its proper divisors (4045607).

12136809 is an equidigital number, since it uses as much as digits as its factorization.

12136809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4045606.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 12136809 is about 3483.7923302057. The cubic root of 12136809 is about 229.8096029849.

The spelling of 12136809 in words is "twelve million, one hundred thirty-six thousand, eight hundred nine".