5811 has 8 divisors (see below), whose sum is σ = 8400. Its totient is φ = 3552.

The previous prime is 5807. The next prime is 5813. The reversal of 5811 is 1185.

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 not a de Polignac number, because 5811 - 2² = 5807 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 5811.

It is not an unprimeable number, because it can be changed into a prime (5813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36 + ... + 113.

It is an arithmetic number, because the mean of its divisors is an integer number (1050).

2⁵⁸¹¹ is an apocalyptic number.

5811 is a deficient number, since it is larger than the sum of its proper divisors (2589).

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 product of its digits is 40, while the sum is 15.

The square root of 5811 is about 76.2299153876. The cubic root of 5811 is about 17.9783690779.

Adding to 5811 its reverse (1185), we get a palindrome (6996).

The spelling of 5811 in words is "five thousand, eight hundred eleven".