Number

263

263 is a prime, odd, a calendar year.

Arithmetic Number Balanced Prime Chen Prime Deficient Number Evil Number Happy Number Prime Recamán's Sequence Safe Prime Sexy Prime Squarefree Year

Historical context — 263 AD

Calendar year

Year 263 (CCLXIII) was a common year starting on Thursday of the Julian calendar.

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

Historical context — 263 BC

Calendar year

Year 263 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: 53
Long year: contains 53 ISO weeks.
Started on: Thursday
January 1, 263
Ended on: Thursday
December 31, 263
Friday the 13ths: 3
3 Friday the 13ths this year.
Decade: 260s
260–269
Century: 3rd century
201–300
Millennium: 1st millennium
1–1000
Years ago: 1,763
1763 years before 2026.

In other calendars

Hebrew: 4023 / 4024 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: 806 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 255 / 256 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 185 / 184 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 11
Digit product: 36
Digital root: 2
Palindrome: No
Bit width: 9 bits
Reversed: 362
Recamán's sequence: a(105) = 263
Square (n²): 69,169
Cube (n³): 18,191,447
Divisor count: 2
σ(n) — sum of divisors: 264
φ(n) — Euler's totient: 262

Primality

263 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)

1 · 263

Aliquot sum (sum of proper divisors): 1

Factor pairs (a × b = 263)

1 × 263

First multiples

263 · 526 (double) · 789 · 1,052 · 1,315 · 1,578 · 1,841 · 2,104 · 2,367 · 2,630

Sums & aliquot sequence

As consecutive integers: 131 + 132

Representations

In words: two hundred sixty-three
Ordinal: 263rd
Roman numeral: CCLXIII
Binary: 100000111
Octal: 407
Hexadecimal: 0x107
Base64: AQc=
One's complement: 65,272 (16-bit)

In other bases

ternary (3) 100202

quaternary (4) 10013

quinary (5) 2023

senary (6) 1115

septenary (7) 524

nonary (9) 322

undecimal (11) 21a

duodecimal (12) 19b

tridecimal (13) 173

tetradecimal (14) 14b

pentadecimal (15) 128

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺
Greek (Milesian): σξγʹ
Mayan (base 20): 𝋭·𝋣
Chinese: 二百六十三
Chinese (financial): 貳佰陸拾參

In other modern scripts

Eastern Arabic ٢٦٣ Devanagari २६३ Bengali ২৬৩ Tamil ௨௬௩ Thai ๒๖๓ Tibetan ༢༦༣ Khmer ២៦៣ Lao ໒໖໓ Burmese ၂၆၃

Digit at this position in famous constants

π — Pi (π): Digit 263 = 4
e — Euler's number (e): Digit 263 = 4
φ — Golden ratio (φ): Digit 263 = 7
√2 — Pythagoras's (√2): Digit 263 = 4
ln 2 — Natural log of 2: Digit 263 = 0
γ — Euler-Mascheroni (γ): Digit 263 = 7

Also seen as

Prime neighborhood

Adjacent primes:

Previous prime: 257 (gap of 6)
Next prime: 269 (gap of 6)

Pair status: sexy with 257, sexy with 269.

Unicode codepoint

Latin Small Letter C With Acute

U+0107

Lowercase letter (Ll)

UTF-8 encoding: C4 87 (2 bytes).

Lookup U+0107 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#000107

RGB(0, 1, 7)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.7.

Address: 0.0.1.7
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.1.7

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