Sunday, 28 December 2014

What can we say about the number 2015?

I'm sorry I haven't written for such a long time but I've been really busy. I've already written about time and how to be a better time manager. I must be honest, I'm still not good in it, so I hope the year 2015 will be maybe better. What could we say about the number 2015? 2015 is a natural number, an odd number and it's not a prime number like 2011 and 2017 for example.
Two thousand fifteen has 8 divisors  namely 1, 5,13, 31, 65, 155, 403, 2015 (here we use all first seven digits: 0, 1, 2, 3, 4, 5, 6) whose sum is 2688.  Moreover, its divisors 13 and 31 are mirror numbers (two numbers are mirror numbers if one can be obtained from the other by reversing the order of the digits). We can expressed 2015 in the binary numeral system (base-2 numeral system) as the number 11111011111 which is a palindromic number (a palindromic number is a number that remains the same when its digits are reversed, a number which is "symmetrical").


Furthermore, the number 2015 can be expressed in Roman numerals as MMXV.
So to sum up, I think 2015 is a nice number!

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