12735609 has 4 divisors (see below), whose sum is σ = 16980816. Its totient is φ = 8490404.

The previous prime is 12735607. The next prime is 12735617. The reversal of 12735609 is 90653721.

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 an emirpimes, since its reverse is a distinct semiprime: 90653721 = 3 ⋅30217907.

It is a cyclic number.

It is not a de Polignac number, because 12735609 - 2¹ = 12735607 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12735609.

It is not an unprimeable number, because it can be changed into a prime (12735607) 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 in 3 ways as a sum of consecutive naturals, for example, 2122599 + ... + 2122604.

It is an arithmetic number, because the mean of its divisors is an integer number (4245204).

Almost surely, 2^12735609 is an apocalyptic number.

It is an amenable number.

12735609 is a deficient number, since it is larger than the sum of its proper divisors (4245207).

12735609 is an equidigital number, since it uses as much as digits as its factorization.

12735609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4245206.

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 12735609 is about 3568.6985022554. The cubic root of 12735609 is about 233.5285085792.

The spelling of 12735609 in words is "twelve million, seven hundred thirty-five thousand, six hundred nine".