Names of 2009
| Nominal | 2009 |
| Cardinal | two thousand nine |
| Ordinal | 2,009th |
| This number as US currency | two thousand nine dollars |
| Is 2009 an odd number? | 2009 is an odd number |
| Is 2009 an even number? | 2009 is NOT an even number |
| Is 2009 a palindrome? | 2009 is NOT a palindrome number |
| Is 2009 a triangle number? | 2009 is NOT a triangle number |
2009 in other Bases
| Base 2 (Binary) | 111110110012 |
| Base 3 (Ternary) | 22021023 |
| Base 4 (Quaternary) | 1331214 |
| Base 5 (Quinary) | 310145 |
| Base 6 (Senary) | 131456 |
| Base 8 (Octal) | 37318 |
| Base 12 (Duodecimal) | 11B512 |
| Base 16 (Hexadecimal) | 7D916 |
| Base 20 (Vigesimal) | 50920 |
Primes and Factors tests for 2009
| Is 2009 a Prime Number? | 2009 is NOT a prime |
| Is 2009 a perfect number? | 2009 is NOT a perfect number |
| Is 2009 a Mersenne Prime? | 2009 is NOT a Mersenne prime |
| Is 2009 a Fermat Prime? | 2009 is NOT a Fermat prime |
| Is 2009 a Fibonacci Prime? | 2009 is NOT a Fibonacci prime |
| Is 2009 a Partition Prime? | 2009 is NOT a Partition prime |
| Is 2009 a Pell Prime? | 2009 is NOT a Pell prime |
| Prime Factors | Prime factors of 2009 |
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2009 in other Numerals
| 2009 in Roman Numeral | MMIX |
| 2009 in Chinese Numeral | 貳仟玖 |
| 2009 in Egyptian Numeral | 𓆽𓐂 |
| 2009 in Babylonian Numeral |   |
Roots and stuff for 2009
| Is 2009 a square number? | 2009 is NOT a square number |
| Is 2009 a cube number? | 2009 is NOT a cube number |
| Square root of the number 2009 | 44.82186966203 |
| Cube root of the number 2009 | 12.618081037132 |
Recreational math for 2009
| Number 2009 reversed | 9002 |
| Sum of the digits | 11 |
| No of digits | 4 |