50811 has 4 divisors (see below), whose sum is σ = 67752. Its totient is φ = 33872.

The previous prime is 50789. The next prime is 50821. The reversal of 50811 is 11805.

It is a happy number.

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 50811 - 2⁷ = 50683 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (50821) 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, 8466 + ... + 8471.

It is an arithmetic number, because the mean of its divisors is an integer number (16938).

2⁵⁰⁸¹¹ is an apocalyptic number.

50811 is a deficient number, since it is larger than the sum of its proper divisors (16941).

50811 is a wasteful number, since it uses less digits than its factorization.

50811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16940.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 50811 is about 225.4129543749. The cubic root of 50811 is about 37.0384309722.

It can be divided in two parts, 50 and 811, that added together give a triangular number (861 = T₄₁).

The spelling of 50811 in words is "fifty thousand, eight hundred eleven".