3811 has 4 divisors (see below), whose sum is σ = 3952. Its totient is φ = 3672.

The previous prime is 3803. The next prime is 3821. The reversal of 3811 is 1183.

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 3811 - 2³ = 3803 is a prime.

It is a Duffinian number.

3811 is a lucky number.

It is a plaindrome in base 12.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 3791 and 3800.

It is not an unprimeable number, because it can be changed into a prime (3821) 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, 15 + ... + 88.

It is an arithmetic number, because the mean of its divisors is an integer number (988).

2³⁸¹¹ is an apocalyptic number.

3811 is a deficient number, since it is larger than the sum of its proper divisors (141).

3811 is a wasteful number, since it uses less digits than its factorization.

3811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140.

The product of its digits is 24, while the sum is 13.

The square root of 3811 is about 61.7332973362. The cubic root of 3811 is about 15.6199503683.

Adding to 3811 its reverse (1183), we get a palindrome (4994).

Subtracting from 3811 its reverse (1183), we obtain a triangular number (2628 = T₇₂).

It can be divided in two parts, 38 and 11, that added together give a square (49 = 7²).

The spelling of 3811 in words is "three thousand, eight hundred eleven".