12147609 has 4 divisors (see below), whose sum is σ = 16196816. Its totient is φ = 8098404.

The previous prime is 12147599. The next prime is 12147659. The reversal of 12147609 is 90674121.

It is a happy number.

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 12147609 - 2⁸ = 12147353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12147659) 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, 2024599 + ... + 2024604.

It is an arithmetic number, because the mean of its divisors is an integer number (4049204).

Almost surely, 2^12147609 is an apocalyptic number.

It is an amenable number.

12147609 is a deficient number, since it is larger than the sum of its proper divisors (4049207).

12147609 is an equidigital number, since it uses as much as digits as its factorization.

12147609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4049206.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 12147609 is about 3485.3420205197. The cubic root of 12147609 is about 229.8777485160.

The spelling of 12147609 in words is "twelve million, one hundred forty-seven thousand, six hundred nine".