Adding to 51012 its reverse (21015), we get a palindrome (72027).
It is a happy number.
It is a tau number, because it is divible by the number of its divisors (36).
It is a nialpdrome in base 16.
It is an unprimeable number.
51012 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
251012 is an apocalyptic number.
51012 is a gapful number since it is divisible by the number (52) 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 51012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70070).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
51012 is a wasteful number, since it uses less digits than its factorization.
51012 is an odious number, because the sum of its binary digits is odd.
The square root of 51012 is about 225.8583626966. The cubic root of 51012 is about 37.0872060369.
The spelling of 51012 in words is "fifty-one thousand, twelve".