81 -- 8+1 = 9 -- square root of 81 = 9
If the sum of the digits of a given number equals nine or a multiple of nine, nine is a factor of that number.
It is another whole number.
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There are several hundred of them. One example, the smallest, is 1039
36 is twice the product of its digits multiplied. 3 times 6 equals 18, and 18 times 2 equals 36.
40 % as a number equals 0.40. 150.00(0.40) = 60, to the justified number of significant digits, since the number "40" is specified to only two such digits.
A whole number is one without digits after the decimal point therefore no number with a decimal point can equal a whole number which means there is no whole number that equals 0.2.
24 divided by three equals 8 divided by four equals 6 2 plus 4 equals 6
The smallest is 29.
Self complimentary codes are codes which after certain number of digits extends itself by taking the compliment of the previous digits.
If the sum of squares of digits of a number equals to the number itself, then that number is called an aram strong number.
9x8x7x6x5x4x3x2x1 or 9! which equals 362880 possible combinations if no digits are repeated
100(943/1048) = 90.0 %, to the justified number of significant digits.