2009 ( two thousand nine ) is a natural number located between the numbers 2008 and 2010.
| 2009 | |
|---|---|
| two thousand nine | |
| ← 2007 · 2008 · 2009 · 2010 · 2011 → | |
| Factorization | 7 2 · 41 |
| Roman notation | MMIX |
| Binary | 11111011001 |
| Octal | 3731 |
| Hexadecimal | 7D9 |
In Math
- 2009 - the number of Hamilton-connected graphs ( Eng. Hamilton-connected graph ) with 8 nodes [1] [2] .
- 2009 - is an odd compound [3] four-digit number.
- The sum of the digits of this number is 11
- The product of the digits of this number is 0
- The square of the number 2009 is 4,036,081.
- The cube of this number is 8 108 486 729.
- The factorial of 2009 (containing 5766 characters) ends exactly with 500 zeros [4]
- The 2009th prime is 17471 and is a palindrome [5] [6]
In other areas
- NGC 2009 is an open cluster in the constellation Golden Fish .
Notes
- ↑ Weisstein, Eric W. Hamilton-connected graph on Wolfram MathWorld .
- ↑ sequence A057865 in OEIS
- ↑ sequence A002808 / b002808.txt in OEIS
- ↑ What's Special About This Number? by Erich Friedman
- ↑ 2009 in Prime Curious!
- ↑ The First 10,000 Primes