11533 has 4 divisors (see below), whose sum is σ = 12160. Its totient is φ = 10908.

The previous prime is 11527. The next prime is 11549. The reversal of 11533 is 33511.

11533 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-11533 is a prime.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285 + ... + 322.

It is an arithmetic number, because the mean of its divisors is an integer number (3040).

2¹¹⁵³³ is an apocalyptic number.

It is an amenable number.

11533 is a deficient number, since it is larger than the sum of its proper divisors (627).

11533 is an equidigital number, since it uses as much as digits as its factorization.

11533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626.

The product of its digits is 45, while the sum is 13.

The square root of 11533 is about 107.3918060189. The cubic root of 11533 is about 22.5933569637.

It can be divided in two parts, 1153 and 3, that added together give a square (1156 = 34²).

The spelling of 11533 in words is "eleven thousand, five hundred thirty-three".