Number

143

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

143 (one hundred forty-three) is an odd 3-digit number. It is a composite number with 4 divisors, and factors as 11 × 13. Written other ways, in Roman numerals it is CXLIII and in binary, 10001111.

Arithmetic Number Cube-Free Deficient Number Gapful Number Odious Number Pernicious Number Recamán's Sequence Self Number Semiprime Squarefree Year

Interestingness

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7 notable facts · grade B

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Historical context — 143 AD

Calendar year

Year 143 (CXLIII) was a common year starting on Monday of the Julian calendar.

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

Historical context — 143 BC

Calendar year

Year 143 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: Tuesday
January 1, 143
Ended on: Tuesday
December 31, 143
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 140s
140–149
Century: 2nd century
101–200
Millennium: 1st millennium
1–1000
Years ago: 1,883
1883 years before 2026.

In other calendars

Hebrew: 3903 / 3904 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Water zodiac:Goat
Sexagenary cycle position 20 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 686 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 135 / 136 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 65 / 64 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 8
Digit product: 12
Digital root: 8
Palindrome: No
Bit width: 8 bits
Reversed: 341
Recamán's sequence: a(746) = 143
Square (n²): 20,449
Cube (n³): 2,924,207
Divisor count: 4
σ(n) — sum of divisors: 168
φ(n) — Euler's totient: 120
Sum of prime factors: 24

Primality

Prime factorization: 11 × 13

Nearest primes: 139 (−4) · 149 (+6)

Divisors & multiples

All divisors (4)

1 · 11 · 13 · 143

Aliquot sum (sum of proper divisors): 25

Factor pairs (a × b = 143)

1 × 143

11 × 13

First multiples

143 · 286 (double) · 429 · 572 · 715 · 858 · 1,001 · 1,144 · 1,287 · 1,430

Sums & aliquot sequence

As consecutive integers: 71 + 72 8 + 9 + … + 18 5 + 6 + … + 17

Aliquot sequence: 143 → 25 → 6 → 6 — reaches a perfect number

Continued fraction of √n

√143 = [11; (1, 22)]

Period length 2 — the block in parentheses repeats forever.

Representations

In words: one hundred forty-three
Ordinal: 143rd
Roman numeral: CXLIII
Binary: 10001111
Octal: 217
Hexadecimal: 0x8F
Base64: jw==
One's complement: 112 (8-bit)
Scientific notation: 1.43 × 10²
As a duration: 143 s = 2 minutes, 23 seconds

In other bases

ternary (3) 12022

quaternary (4) 2033

quinary (5) 1033

senary (6) 355

septenary (7) 263

nonary (9) 168

undecimal (11) 120

duodecimal (12) bb

tridecimal (13) b0

tetradecimal (14) a3

pentadecimal (15) 98

As an angle

143°

143° ≈ 2.496 rad

Compass bearing: SE (southeast)

Why does a circle have 360 degrees? →

Historical numeral systems

Babylonian (base 60): 𒁹𒁹 𒌋𒌋𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓎆𓎆𓎆𓎆𓏺𓏺𓏺
Greek (Milesian): ρμγʹ
Mayan (base 20): 𝋧·𝋣
Chinese: 一百四十三
Chinese (financial): 壹佰肆拾參

In other modern scripts

Eastern Arabic ١٤٣ Devanagari १४३ Bengali ১৪৩ Tamil ௧௪௩ Thai ๑๔๓ Tibetan ༡༤༣ Khmer ១៤៣ Lao ໑໔໓ Burmese ၁၄၃

Digit at this position in famous constants

π — Pi (π): Digit 143 = 3
e — Euler's number (e): Digit 143 = 3
φ — Golden ratio (φ): Digit 143 = 1
√2 — Pythagoras's (√2): Digit 143 = 1
ln 2 — Natural log of 2: Digit 143 = 6
γ — Euler-Mascheroni (γ): Digit 143 = 1

Also seen as

Unicode codepoint

Single Shift Three

U+008F

Control character (Cc)

UTF-8 encoding: C2 8F (2 bytes).

Lookup U+008F on Compart ↗ Lookup on FileFormat.Info ↗

Network port

TCP/UDP port 143 is the well-known port for IMAP — Internet Message Access Protocol.

Hex color

#00008F

RGB(0, 0, 143)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.143.

Address: 0.0.0.143
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.0.143

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

Musical pitch

Heard as a frequency, 143 Hz is closest to:

Concert pitch (A4 = 440 Hz): D3 (146.8 Hz, -46¢ — about midway to C♯3)
Scientific pitch (C4 = 256 Hz): D3 (143.7 Hz, -8¢)
Baroque pitch (A4 = 415 Hz): D♯3 (146.7 Hz, -45¢ — about midway to D3)