Adding to 51000 its reverse (15), we get a palindrome (51015).
51000 is nontrivially palindromic in base 13.
51000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.
It is a nialpdrome in base 10.
It is a zygodrome in base 2.
It is a self number, because there is not a number n which added to its sum of digits gives 51000.
It is a congruent number.
251000 is an apocalyptic number.
51000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 51000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84240).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
51000 is a wasteful number, since it uses less digits than its factorization.
51000 is an evil number, because the sum of its binary digits is even.
The square root of 51000 is about 225.8317958127. The cubic root of 51000 is about 37.0842976927.
The spelling of 51000 in words is "fifty-one thousand".