Number

841

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

Deficient Number Descending Digits Odious Number Perfect Square Pernicious Number Powerful Number Recamán's Sequence Semiprime Year

Historical context — 841 AD

Calendar year

Year 841 (DCCCXLI) was a common year starting on Saturday of the Julian calendar.

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Historical context — 841 BC

Decade

This article concerns the period 849 BC – 840 BC.

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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, 841
Ended on: Tuesday
December 31, 841
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 840s
840–849
Century: 9th century
801–900
Millennium: 1st millennium
1–1000
Years ago: 1,185
1185 years before 2026.

In other calendars

Hebrew: 4601 / 4602 AM
Rosh Hashanah falls in September/October.
Islamic Hijri: 226 / 227 AH
Lunar calendar; year spans differ from Gregorian.
Chinese: Year of the zodiac:Metal zodiac:Rooster
Sexagenary cycle position 58 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 1384 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Persian Solar Hijri: 219 / 220 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
Ethiopian: 833 / 834 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 763 / 762 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 13
Digit product: 32
Digital root: 4
Palindrome: No
Bit width: 10 bits
Reversed: 148
Recamán's sequence: a(341) = 841
Square (n²): 707,281
Cube (n³): 594,823,321
Square root (√n): 29
Divisor count: 3
σ(n) — sum of divisors: 871
φ(n) — Euler's totient: 812
Sum of prime factors: 58

Primality

Prime factorization: 29 ²

Nearest primes: 839 (−2) · 853 (+12)

Divisors & multiples

All divisors (3)

1 · 29 · 841

Aliquot sum (sum of proper divisors): 30

Factor pairs (a × b = 841)

1 × 841

29 × 29

First multiples

841 · 1,682 (double) · 2,523 · 3,364 · 4,205 · 5,046 · 5,887 · 6,728 · 7,569 · 8,410

Sums & aliquot sequence

As a sum of two squares: 0² + 29² = 20² + 21²

As consecutive integers: 420 + 421 15 + 16 + … + 43

Aliquot sequence: 841 → 30 → 42 → 54 → 66 → 78 → 90 → 144 → 259 → 45 → 33 → 15 → 9 → 4 → 3 → 1 → 0 — terminates at zero

Representations

In words: eight hundred forty-one
Ordinal: 841st
Roman numeral: DCCCXLI
Binary: 1101001001
Octal: 1511
Hexadecimal: 0x349
Base64: A0k=
One's complement: 64,694 (16-bit)

In other bases

ternary (3) 1011011

quaternary (4) 31021

quinary (5) 11331

senary (6) 3521

septenary (7) 2311

nonary (9) 1134

undecimal (11) 6a5

duodecimal (12) 5a1

tridecimal (13) 4c9

tetradecimal (14) 441

pentadecimal (15) 3b1

Historical numeral systems

Babylonian (base 60): 𒌋𒁹𒁹𒁹𒁹 𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓏺
Greek (Milesian): ωμαʹ
Mayan (base 20): 𝋢·𝋢·𝋡
Chinese: 八百四十一
Chinese (financial): 捌佰肆拾壹

In other modern scripts

Eastern Arabic ٨٤١ Devanagari ८४१ Bengali ৮৪১ Tamil ௮௪௧ Thai ๘๔๑ Tibetan ༨༤༡ Khmer ៨៤១ Lao ໘໔໑ Burmese ၈၄၁

Digit at this position in famous constants

π — Pi (π): Digit 841 = 5
e — Euler's number (e): Digit 841 = 5
φ — Golden ratio (φ): Digit 841 = 5
√2 — Pythagoras's (√2): Digit 841 = 5
ln 2 — Natural log of 2: Digit 841 = 2
γ — Euler-Mascheroni (γ): Digit 841 = 2

Also seen as

Unicode codepoint

Combining Left Angle Below

U+0349

Non-spacing mark (Mn)

UTF-8 encoding: CD 89 (2 bytes).

Lookup U+0349 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#000349

RGB(0, 3, 73)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.73.

Address: 0.0.3.73
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.3.73

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