Number

209

209 is a composite number, odd, a calendar year.

Arithmetic Number Deficient Number Evil Number Harshad / Niven Perrin Number Recamán's Sequence Self Number Semiprime Squarefree Year

Historical context — 209 AD

Calendar year

Year 209 (CCIX) was a common year starting on Sunday of the Julian calendar.

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Historical context — 209 BC

Calendar year

Year 209 BC was a year of the pre-Julian Roman calendar.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 · English fallback Read the full article on Wikipedia →

Year facts

Year type: Common year
Standard 365-day year; not divisible by 4 (or divisible by 100 but not 400).
Days in year: 365
ISO weeks: 52
Started on: Sunday
January 1, 209
Ended on: Sunday
December 31, 209
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 200s
200–209
Century: 3rd century
201–300
Millennium: 1st millennium
1–1000
Years ago: 1,817
1817 years before 2026.

In other calendars

Hebrew: 3969 / 3970 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Earth zodiac:Ox
Sexagenary cycle position 26 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 752 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 201 / 202 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 131 / 130 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 11
Digit product: 0
Digital root: 2
Palindrome: No
Bit width: 8 bits
Reversed: 902
Recamán's sequence: a(2,614) = 209
Square (n²): 43,681
Cube (n³): 9,129,329
Divisor count: 4
σ(n) — sum of divisors: 240
φ(n) — Euler's totient: 180
Sum of prime factors: 30

Primality

Prime factorization: 11 × 19

Nearest primes: 199 (−10) · 211 (+2)

Divisors & multiples

All divisors (4)

1 · 11 · 19 · 209

Aliquot sum (sum of proper divisors): 31

Factor pairs (a × b = 209)

1 × 209

11 × 19

First multiples

209 · 418 (double) · 627 · 836 · 1,045 · 1,254 · 1,463 · 1,672 · 1,881 · 2,090

Sums & aliquot sequence

As consecutive integers: 104 + 105 14 + 15 + … + 24 2 + 3 + … + 20

Aliquot sequence: 209 → 31 → 1 → 0 — terminates at zero

Representations

In words: two hundred nine
Ordinal: 209th
Roman numeral: CCIX
Binary: 11010001
Octal: 321
Hexadecimal: 0xD1
Base64: 0Q==
One's complement: 46 (8-bit)

In other bases

ternary (3) 21202

quaternary (4) 3101

quinary (5) 1314

senary (6) 545

septenary (7) 416

nonary (9) 252

undecimal (11) 180

duodecimal (12) 155

tridecimal (13) 131

tetradecimal (14) 10d

pentadecimal (15) de

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): σθʹ
Mayan (base 20): 𝋪·𝋩
Chinese: 二百零九
Chinese (financial): 貳佰零玖

In other modern scripts

Eastern Arabic ٢٠٩ Devanagari २०९ Bengali ২০৯ Tamil ௨௦௯ Thai ๒๐๙ Tibetan ༢༠༩ Khmer ២០៩ Lao ໒໐໙ Burmese ၂၀၉

Digit at this position in famous constants

π — Pi (π): Digit 209 = 9
e — Euler's number (e): Digit 209 = 1
φ — Golden ratio (φ): Digit 209 = 7
√2 — Pythagoras's (√2): Digit 209 = 9
ln 2 — Natural log of 2: Digit 209 = 4
γ — Euler-Mascheroni (γ): Digit 209 = 2

Also seen as

Unicode codepoint

Latin Capital Letter N With Tilde

U+00D1

Uppercase letter (Lu)

UTF-8 encoding: C3 91 (2 bytes).

Lookup U+00D1 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#0000D1

RGB(0, 0, 209)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.209.

Address: 0.0.0.209
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.0.209

Unspecified address (0.0.0.0/8) — "this network" placeholder.

NANP area code 209

The number 209 is an active NANP area code (North American Numbering Plan).

Primary area: Stockton / Modesto
Region: California
Country: United States

Most NANP area codes have multiple overlays in dense regions; the primary area listed is the historic/largest population center for this code.

Look up area code 209 ↗