51918 has 16 divisors (see below), whose sum is σ = 110160. Its totient is φ = 16256.

The previous prime is 51913. The next prime is 51929. The reversal of 51918 is 81915.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51913) by changing a digit.

51918 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153 + ... + 356.

It is an arithmetic number, because the mean of its divisors is an integer number (6885).

2⁵¹⁹¹⁸ is an apocalyptic number.

51918 is an abundant number, since it is smaller than the sum of its proper divisors (58242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55080).

51918 is a wasteful number, since it uses less digits than its factorization.

51918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531.

The product of its digits is 360, while the sum is 24.

The square root of 51918 is about 227.8552171885. The cubic root of 51918 is about 37.3054816363.

It can be divided in two parts, 51 and 918, that added together give a palindrome (969).

The spelling of 51918 in words is "fifty-one thousand, nine hundred eighteen".