Number

549

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

549 (five hundred forty-nine) is an odd 3-digit number. It is a composite number with 6 divisors, and factors as 3² × 61. Written other ways, in Roman numerals it is DXLIX and in binary, 1000100101.

Cube-Free Deficient Number Evil Number Recamán's Sequence Year

Interestingness

★ ☆ ☆ ☆ ☆

2 notable facts · grade F

537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561

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Historical context — 549 AD

Calendar year

Year 549 (DXLIX) was a common year starting on Friday of the Julian calendar.

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

Historical context — 549 BC

Calendar year

The year 549 BC was a year of the pre-Julian Roman calendar.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 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: Wednesday
January 1, 549
Ended on: Wednesday
December 31, 549
Friday the 13ths: 1
One Friday the 13th this year.
Decade: 540s
540–549
Century: 6th century
501–600
Millennium: 1st millennium
1–1000
Years ago: 1,477
1477 years before 2026.

In other calendars

Hebrew: 4309 / 4310 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Earth zodiac:Snake
Sexagenary cycle position 6 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 1092 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 541 / 542 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 471 / 470 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 18
Digit product: 180
Digital root: 9
Palindrome: No
Bit width: 10 bits
Reversed: 945
Recamán's sequence: a(1,161) = 549
Square (n²): 301,401
Cube (n³): 165,469,149
Divisor count: 6
σ(n) — sum of divisors: 806
φ(n) — Euler's totient: 360
Sum of prime factors: 67

Primality

Prime factorization: 3 ² × 61

Nearest primes: 547 (−2) · 557 (+8)

Divisors & multiples

All divisors (6)

1 · 3 · 9 · 61 · 183 · 549

Aliquot sum (sum of proper divisors): 257

Factor pairs (a × b = 549)

1 × 549

3 × 183

9 × 61

First multiples

549 · 1,098 (double) · 1,647 · 2,196 · 2,745 · 3,294 · 3,843 · 4,392 · 4,941 · 5,490

Sums & aliquot sequence

As a sum of two squares: 15² + 18²

As consecutive integers: 274 + 275 182 + 183 + 184 89 + 90 + 91 + 92 + 93 + 94 57 + 58 + … + 65

Aliquot sequence: 549 → 257 → 1 → 0 — terminates at zero

Continued fraction of √n

√549 = [23; (2, 3, 9, 11, 1, 1, 1, 1, 4, 1, 1, 1, 1, 11, 9, 3, 2, 46)]

Period length 18 — the block in parentheses repeats forever.

Representations

In words: five hundred forty-nine
Ordinal: 549th
Roman numeral: DXLIX
Binary: 1000100101
Octal: 1045
Hexadecimal: 0x225
Base64: AiU=
One's complement: 64,986 (16-bit)
Scientific notation: 5.49 × 10²
As a duration: 549 s = 9 minutes, 9 seconds

In other bases

ternary (3) 202100

quaternary (4) 20211

quinary (5) 4144

senary (6) 2313

septenary (7) 1413

nonary (9) 670

undecimal (11) 45a

duodecimal (12) 399

tridecimal (13) 333

tetradecimal (14) 2b3

pentadecimal (15) 269

Palindromic in base 13

As an angle

549° = 1 × 360° + 189°

189° ≈ 3.299 rad

Compass bearing: S (south)

Why does a circle have 360 degrees? →

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): φμθʹ
Mayan (base 20): 𝋡·𝋧·𝋩
Chinese: 五百四十九
Chinese (financial): 伍佰肆拾玖

In other modern scripts

Eastern Arabic ٥٤٩ Devanagari ५४९ Bengali ৫৪৯ Tamil ௫௪௯ Thai ๕๔๙ Tibetan ༥༤༩ Khmer ៥៤៩ Lao ໕໔໙ Burmese ၅၄၉

Digit at this position in famous constants

π — Pi (π): Digit 549 = 7
e — Euler's number (e): Digit 549 = 8
φ — Golden ratio (φ): Digit 549 = 8
√2 — Pythagoras's (√2): Digit 549 = 7
ln 2 — Natural log of 2: Digit 549 = 4
γ — Euler-Mascheroni (γ): Digit 549 = 2

Also seen as

Unicode codepoint

Latin Small Letter Z With Hook

U+0225

Lowercase letter (Ll)

UTF-8 encoding: C8 A5 (2 bytes).

Lookup U+0225 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#000225

RGB(0, 2, 37)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.2.37.

Address: 0.0.2.37
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.2.37

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

Musical pitch

Heard as a frequency, 549 Hz is closest to:

Concert pitch (A4 = 440 Hz): C♯5 (554.4 Hz, -17¢)
Scientific pitch (C4 = 256 Hz): C♯5 (542.4 Hz, +21¢)
Baroque pitch (A4 = 415 Hz): D5 (554 Hz, -16¢)