Adding to 5811 its reverse (1185), we get a palindrome (6996).
It is a happy number.
5811 is nontrivially palindromic in base 12.
It is a sphenic number, since it is the product of 3 distinct primes.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 5811.
25811 is an apocalyptic number.
5811 is a wasteful number, since it uses less digits than its factorization.
5811 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 165.
The square root of 5811 is about 76.2299153876. The cubic root of 5811 is about 17.9783690779.
The spelling of 5811 in words is "five thousand, eight hundred eleven".