Of all the numbers, 81 was rated one of the top. It is consistently in the annual 'Euphoric Numbers Contest' top 10. They only number that is guaranteed to be happier than 81 is 3.
There is no recorded number for this statistic. There are definitely plenty to keep everyone in the world happy, however.
No, 81 is an odd number.
The square number of 81 is 9. 9 x 9 = 81
81 is not prime it's a composite number
81 is not a prime number. 81 = 3 * 3 * 3 * 3
No, -81 is not an irrational number because it can be represented in the form x/y = -81
It is a composite number, you can get 81 by mulitpling 1*81, 3*27, and 9*9.compositeNo the number 81 is not prime it can be divided by nine.composite
66.6% of 81= 66.6% * 81= 0.666 * 81= 53.946
Number 81 on the periodic table is Thallium.
81 is an odd composite number.
81 is a square number
81 is a rational number