11091 has 4 divisors (see below), whose sum is σ = 14792. Its totient is φ = 7392.

The previous prime is 11087. The next prime is 11093. The reversal of 11091 is 19011.

11091 is digitally balanced in base 3, 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 an emirpimes, since its reverse is a distinct semiprime: 19011 = 3 ⋅6337.

It is not a de Polignac number, because 11091 - 2² = 11087 is a prime.

It is a D-number.

It is a Duffinian number.

11091 is a lucky number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (11093) 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, 1846 + ... + 1851.

It is an arithmetic number, because the mean of its divisors is an integer number (3698).

2¹¹⁰⁹¹ is an apocalyptic number.

11091 is a deficient number, since it is larger than the sum of its proper divisors (3701).

11091 is an equidigital number, since it uses as much as digits as its factorization.

11091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3700.

The product of its (nonzero) digits is 9, while the sum is 12.

The square root of 11091 is about 105.3138167573. The cubic root of 11091 is about 22.3009604981.

The spelling of 11091 in words is "eleven thousand, ninety-one".