11911 has 4 divisors (see below), whose sum is σ = 12232. Its totient is φ = 11592.

The previous prime is 11909. The next prime is 11923.

11911 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11911 - 2¹ = 11909 is a prime.

It is a Duffinian number.

11911 is a lucky number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 11891 and 11900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11941) 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, 96 + ... + 181.

It is an arithmetic number, because the mean of its divisors is an integer number (3058).

2¹¹⁹¹¹ is an apocalyptic number.

11911 is a deficient number, since it is larger than the sum of its proper divisors (321).

11911 is an equidigital number, since it uses as much as digits as its factorization.

11911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320.

The product of its digits is 9, while the sum is 13.

The square root of 11911 is about 109.1375279178. The cubic root of 11911 is about 22.8375445847.

The spelling of 11911 in words is "eleven thousand, nine hundred eleven".