It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is a D-number.
11391 is a lucky number.
It is a self number, because there is not a number n which added to its sum of digits gives 11391.
It is a congruent number.
211391 is an apocalyptic number.
11391 is the 68-th centered pentagonal number.
11391 is an equidigital number, since it uses as much as digits as its factorization.
11391 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3800.
The square root of 11391 is about 106.7286278371. The cubic root of 11391 is about 22.5002469109.
The spelling of 11391 in words is "eleven thousand, three hundred ninety-one".