51516 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a tau number, because it is divible by the number of its divisors (36).
It is an Ulam number.
It is a nialpdrome in base 9.
It is a congruent number.
251516 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 51516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68796).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
51516 is a wasteful number, since it uses less digits than its factorization.
51516 is an evil number, because the sum of its binary digits is even.
The square root of 51516 is about 226.9713638325. The cubic root of 51516 is about 37.2089468595.
Subtracting 51516 from its reverse (61515), we obtain a palindrome (9999).
The spelling of 51516 in words is "fifty-one thousand, five hundred sixteen".