209 (number)

← 208 209 210 →
← 200 210 220 230 240 250 260 270 280 290 → List of numbers — Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	two hundred nine
Ordinal	209th (two hundred and ninth)
Factorization	11 × 19
Roman numeral	CCIX
Binary	110100012
Ternary	212023
Quaternary	31014
Quinary	13145
Senary	5456
Octal	3218
Duodecimal	15512
Hexadecimal	D116
Vigesimal	A920
Base 36	5T36

209 (two hundred [and] nine) is the natural number following 208 and preceding 210.

In mathematics

There are 209 spanning trees in a 2 × 5 grid graph,^[1] and 209 partial permutations on four elements.^[2]

See also

• Asteroid 209 Dido
• List of highways numbered 209
• Type 209 submarine, German submarine developed for export

References

1. "Sloane's A001353 : a(n) = 4*a(n-1) - a(n-2) with a(0) = 0, a(1) = 1". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
2. "Sloane's A002720 : Number of partial permutations of an n-set; number of n X n binary matrices with at most one 1 in each row and column". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.