47811 has 4 divisors (see below), whose sum is σ = 63752. Its totient is φ = 31872.

The previous prime is 47809. The next prime is 47819. The reversal of 47811 is 11874.

Added to its reverse (11874) it gives a triangular number (59685 = T₃₄₅).

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 47811 - 2¹ = 47809 is a prime.

It is a D-number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 47811.

It is not an unprimeable number, because it can be changed into a prime (47819) 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, 7966 + ... + 7971.

It is an arithmetic number, because the mean of its divisors is an integer number (15938).

2⁴⁷⁸¹¹ is an apocalyptic number.

47811 is a deficient number, since it is larger than the sum of its proper divisors (15941).

47811 is a wasteful number, since it uses less digits than its factorization.

47811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15940.

The product of its digits is 224, while the sum is 21.

The square root of 47811 is about 218.6572660581. The cubic root of 47811 is about 36.2946496983.

Adding to 47811 its reverse (11874), we get a triangular number (59685 = T₃₄₅).

Subtracting from 47811 its reverse (11874), we obtain a cube (35937 = 33³).

It can be divided in two parts, 47 and 811, that added together give a palindrome (858).

The spelling of 47811 in words is "forty-seven thousand, eight hundred eleven".