11609 has 8 divisors (see below), whose sum is σ = 13440. Its totient is φ = 9936.

The previous prime is 11597. The next prime is 11617. The reversal of 11609 is 90611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11609 - 2⁴ = 11593 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a nialpdrome in base 14.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 11609.

It is not an unprimeable number, because it can be changed into a prime (11689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224 + ... + 270.

It is an arithmetic number, because the mean of its divisors is an integer number (1680).

2¹¹⁶⁰⁹ is an apocalyptic number.

11609 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

11609 is a deficient number, since it is larger than the sum of its proper divisors (1831).

11609 is a wasteful number, since it uses less digits than its factorization.

11609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 11609 is about 107.7450694928. The cubic root of 11609 is about 22.6428768086.

It can be divided in two parts, 1160 and 9, that multiplied together give a triangular number (10440 = T₁₄₄).

The spelling of 11609 in words is "eleven thousand, six hundred nine".