11999609 has 4 divisors (see below), whose sum is σ = 12044160. Its totient is φ = 11955060.

The previous prime is 11999563. The next prime is 11999653. The reversal of 11999609 is 90699911.

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 a cyclic number.

It is not a de Polignac number, because 11999609 - 2¹² = 11995513 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11999609.

It is not an unprimeable number, because it can be changed into a prime (11999699) 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, 21869 + ... + 22410.

It is an arithmetic number, because the mean of its divisors is an integer number (3011040).

Almost surely, 2^11999609 is an apocalyptic number.

It is an amenable number.

11999609 is a deficient number, since it is larger than the sum of its proper divisors (44551).

11999609 is an equidigital number, since it uses as much as digits as its factorization.

11999609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44550.

The product of its (nonzero) digits is 39366, while the sum is 44.

The square root of 11999609 is about 3464.0451786892. The cubic root of 11999609 is about 228.9403619099.

The spelling of 11999609 in words is "eleven million, nine hundred ninety-nine thousand, six hundred nine".