51243 has 16 divisors (see below), whose sum is σ = 76800. Its totient is φ = 30240.

The previous prime is 51241. The next prime is 51257. The reversal of 51243 is 34215.

It is not a de Polignac number, because 51243 - 2¹ = 51241 is a prime.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (51241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1638 + ... + 1668.

It is an arithmetic number, because the mean of its divisors is an integer number (4800).

2⁵¹²⁴³ is an apocalyptic number.

51243 is a deficient number, since it is larger than the sum of its proper divisors (25557).

51243 is a wasteful number, since it uses less digits than its factorization.

51243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82.

The product of its digits is 120, while the sum is 15.

The square root of 51243 is about 226.3691675118. The cubic root of 51243 is about 37.1431029851.

Adding to 51243 its reverse (34215), we get a palindrome (85458).

It can be divided in two parts, 512 and 43, that added together give a palindrome (555).

The spelling of 51243 in words is "fifty-one thousand, two hundred forty-three".