It is a tau number, because it is divible by the number of its divisors (56).
It is a nialpdrome in base 16.
It is a self number, because there is not a number n which added to its sum of digits gives 51520.
It is a congruent number.
251520 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 51520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73152).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
51520 is a wasteful number, since it uses less digits than its factorization.
51520 is an odious number, because the sum of its binary digits is odd.
The square root of 51520 is about 226.9801753458. The cubic root of 51520 is about 37.2099098738.
The spelling of 51520 in words is "fifty-one thousand, five hundred twenty".