# Today is September, 9, 2009 or 9/9/09

1. Sep 9, 2009

### Jimmy Snyder

Today is September, 9, 2009 or 9/9/09 which, if it weren't for that irritating little zero, would be 9/9/9, and thereby would have been an important coincidence and trivia fact of some note. Nothing like this has happened since August 8, last year. Here are some amazing facts about the number nine to fool your friends with.

9 is the largest single digit number in the decimal system.
9 is the smallest odd number that isn't a prime, except for 1 and all the negative odd numbers.
9 is the smallest odd square integer, except for 1.
9 is 6 upside down, which means that 9/9/09 upside down is 60/6/6, somewhat like the number of the beast.
9 is the number of planets if you count Pluto.
9 times 9 is 81, and 8 plus 1 is 9.
9 is the number of the best cloud.
9 is the official integer of the Beatles White album.
9 is the number of fun facts if you count this one.

Life would be dull indeed without this seemingly mundane, yet odd, integer.

2. Sep 9, 2009

### Staff: Mentor

Re: 9/9/09

Yes, nine has a lot of interesting properties, like:

1+8=9
2+7=9
3+6=9
4+5=9
5+4=9
6+3=9
7+2=9
8+1=9

Fascinating indeed - whichever way you try, it gives 9.

999=33*37 - to make three nines, we need three threes and a seven thrown in, which as we know is a lucky number.

3. Sep 9, 2009

Re: 9/9/09

.The third square and therefore the sum of two consecutive triangular numbers 9=3+6
.Written as 100 in base 3
.The only square that is the sum of two consecutive cubes 9=1 cubed +2 cubed
.The 4th lucky number,and the first square lucky number apart from 1
.9=1!+2!+3!
.The smallest Kaprekar number apart from1.9 squared=81 and 8+1=9
.There are nine regular polyhedra,the 5 Platonic solids and the 4 Kepler Poinsot stellated polyhedra.
.9 is the smallest numberof distinct integral squares into which a rectangle may be divided.The smallest solution is 32 by 33 and the squares have sides 1,4,7,8,9,10,14,15and 18.
.No in German is pronounced nine(Sorry I wanted to make 9 points)

4. Sep 9, 2009

### WhoWee

Re: 9/9/09

Actually, it could be written in this manner - 09/09/09.

5. Sep 9, 2009

### Jimmy Snyder

Re: 9/9/09

But then we would be at a complete loss to know which 09 was for the year, month, and date. At least with 9/9/09, some of that confusion is reduced.

6. Sep 9, 2009

### WhoWee

Re: 9/9/09

I attempted to post at 09:09:09 on 09/09/09, but my computer wasn't fast enough.

7. Sep 9, 2009

Re: 9/9/09

good one!

8. Sep 9, 2009

### mgb_phys

Re: 9/9/09

9 is the number of fingers on an inattentive wood shop worker.

9. Sep 9, 2009

### Staff: Mentor

Re: 9/9/09

After the first day, the story doesn't end here.

10. Sep 9, 2009

### drizzle

Re: 9/9/09

:rofl:

there're still other similar dates such as 10/10/10, 11/11/11, 12/12/12, that's it..

11. Sep 9, 2009

### WhoWee

Re: 9/9/09

I was born at 10:10 on 10/10/1959 - the 10th year of the decade.

Somehow my lucky number is 812?

12. Sep 9, 2009

### Astronuc

Staff Emeritus
Re: 9/9/09

But,

1 is the lonliest number.

13. Sep 9, 2009

### turbo

Re: 9/9/09

As a kid, I was fascinated by the number four, and geometric representations of groups of 4 in 2 and 3 dimensions. Unfortunately, I missed the chance to celebrate on 04/04/04, so I'll just have to wait for it to come around again.

14. Sep 9, 2009

### WhoWee

Re: 9/9/09

And yet so many people want to be #1.

15. Sep 9, 2009

### Staff: Mentor

Re: 9/9/09

AFAIR I have managed to remember to celebrate my 10,000th day but I forgot the 15,000th

Next nice occasion will be in 2017.

16. Sep 9, 2009

### turbo

Re: 9/9/09

Darn! 20,000 slipped by me. Well, at least I can shoot for 21,000 in a little over 5 weeks.

17. Sep 9, 2009

### CompuChip

Re: 9/9/09

Wow, that's just amazing. That can't be a coincidence!
Don't forget this remarkable fact: nine is 10 in base 9, but 9 modulo 10... !!

18. Sep 9, 2009

### leroyjenkens

Re: 9/9/09

You're a little late on this 9/9/9 thing; it happened two thousand years ago. There's nothing significant about 9/9/2009.
No problem though, just wait exactly 7990 years and catch that one.

19. Sep 9, 2009

### Jimmy Snyder

Re: 9/9/09

Why? What's going to happen in 7990 years that didn't happen this year?

20. Sep 9, 2009