11639 has 4 divisors (see below), whose sum is σ = 11856. Its totient is φ = 11424.

The previous prime is 11633. The next prime is 11657. The reversal of 11639 is 93611.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 11639 - 2⁸ = 11383 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12 and base 15.

It is a nialpdrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 11639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11633) 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, 47 + ... + 159.

It is an arithmetic number, because the mean of its divisors is an integer number (2964).

2¹¹⁶³⁹ is an apocalyptic number.

11639 is a deficient number, since it is larger than the sum of its proper divisors (217).

11639 is a wasteful number, since it uses less digits than its factorization.

11639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216.

The product of its digits is 162, while the sum is 20.

The square root of 11639 is about 107.8841971746. The cubic root of 11639 is about 22.6623646199.

The spelling of 11639 in words is "eleven thousand, six hundred thirty-nine".