12578609 has 4 divisors (see below), whose sum is σ = 12587520. Its totient is φ = 12569700.

The previous prime is 12578603. The next prime is 12578611. The reversal of 12578609 is 90687521.

12578609 is digitally balanced in base 3, 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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90687521 = 2393 ⋅37897.

It is a cyclic number.

It is not a de Polignac number, because 12578609 - 2⁴ = 12578593 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12578603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1817 + ... + 5334.

It is an arithmetic number, because the mean of its divisors is an integer number (3146880).

Almost surely, 2^12578609 is an apocalyptic number.

It is an amenable number.

12578609 is a deficient number, since it is larger than the sum of its proper divisors (8911).

12578609 is an equidigital number, since it uses as much as digits as its factorization.

12578609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8910.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 12578609 is about 3546.6334741555. The cubic root of 12578609 is about 232.5649196289.

The spelling of 12578609 in words is "twelve million, five hundred seventy-eight thousand, six hundred nine".