47851 has 4 divisors (see below), whose sum is σ = 48400. Its totient is φ = 47304.

The previous prime is 47843. The next prime is 47857. The reversal of 47851 is 15874.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 15874 = 2 ⋅7937.

It is a cyclic number.

It is not a de Polignac number, because 47851 - 2³ = 47843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111 + ... + 328.

It is an arithmetic number, because the mean of its divisors is an integer number (12100).

2⁴⁷⁸⁵¹ is an apocalyptic number.

47851 is a deficient number, since it is larger than the sum of its proper divisors (549).

47851 is a wasteful number, since it uses less digits than its factorization.

47851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548.

The product of its digits is 1120, while the sum is 25.

The square root of 47851 is about 218.7487142819. The cubic root of 47851 is about 36.3047685782.

It can be divided in two parts, 478 and 51, that added together give a square (529 = 23²).

The spelling of 47851 in words is "forty-seven thousand, eight hundred fifty-one".