51847 has 4 divisors (see below), whose sum is σ = 52360. Its totient is φ = 51336.

The previous prime is 51839. The next prime is 51853. The reversal of 51847 is 74815.

51847 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 51847 - 2³ = 51839 is a prime.

It is a super-2 number, since 2×51847² = 5376222818, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51817) 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, 48 + ... + 325.

It is an arithmetic number, because the mean of its divisors is an integer number (13090).

2⁵¹⁸⁴⁷ is an apocalyptic number.

51847 is a deficient number, since it is larger than the sum of its proper divisors (513).

51847 is a wasteful number, since it uses less digits than its factorization.

51847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512.

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

The square root of 51847 is about 227.6993631963. The cubic root of 51847 is about 37.2884682851.

It can be divided in two parts, 518 and 47, that added together give a palindrome (565).

The spelling of 51847 in words is "fifty-one thousand, eight hundred forty-seven".