Any of its factors which are: 1, 3, 9, 27 and 81
1. The numbers are co-prime
These numbers: 1, 3, 9, 27, 81, 243.
The greatest common factor of both numbers is 3
6.9877
1 and 81 Those two numbers certainly divide into 81 though they are not the only numbers to do so.
81*81 is rational. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.
81 is a composite number.
Techcially all numbers are divisible by 81, however many would result in a decimal answer. If you mean how many numbers are divisible by 81 and have an integer answer, then it is "all multiples of 81" - e.g 81 x 2, 81 x 3 etc...81, 162, 243 and keep adding 81 forever.
1 goes into 81 81 times.
The only prime numbers between 81 and 90 is... 83
It depends on what average you want to find. To find the mean of 81, 81, 98, and 91 add the numbers together and divide by 4 (the number of numbers you added). 81 + 81 + 98 + 91 = 351 351 divided by 4 = 87.75. To find the median, list the numbers in order and find the one in the middle. 81, 81, 91, 98 81 and 91 are in the middle. To find the mode, look for the number that appears the most, 81 appears twice and the other numbers appear once. 81 is the mode.
The factors of 81 are: 1, 3, 9, 27, 81.