Number

671

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

Arithmetic Number Deficient Number Gapful Number Happy Number Odious Number Pernicious Number Recamán's Sequence Semiprime Squarefree Year

Historical context — 671 AD

Calendar year

Year 671 (DCLXXI) was a common year starting on Wednesday of the Julian calendar.

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Historical context — 671 BC

Calendar year

The year 671 BC was a year of the pre-Julian Roman calendar.

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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: Sunday
January 1, 671
Ended on: Sunday
December 31, 671
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 670s
670–679
Century: 7th century
601–700
Millennium: 1st millennium
1–1000
Years ago: 1,355
1355 years before 2026.

In other calendars

Hebrew: 4431 / 4432 AM
Rosh Hashanah falls in September/October.
Islamic Hijri: 50 / 51 AH
Lunar calendar; year spans differ from Gregorian.
Chinese: Year of the zodiac:Metal zodiac:Goat
Sexagenary cycle position 8 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 1214 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Persian Solar Hijri: 49 / 50 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
Ethiopian: 663 / 664 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 593 / 592 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 14
Digit product: 42
Digital root: 5
Palindrome: No
Bit width: 10 bits
Reversed: 176
Recamán's sequence: a(2,282) = 671
Square (n²): 450,241
Cube (n³): 302,111,711
Divisor count: 4
σ(n) — sum of divisors: 744
φ(n) — Euler's totient: 600
Sum of prime factors: 72

Primality

Prime factorization: 11 × 61

Nearest primes: 661 (−10) · 673 (+2)

Divisors & multiples

All divisors (4)

1 · 11 · 61 · 671

Aliquot sum (sum of proper divisors): 73

Factor pairs (a × b = 671)

1 × 671

11 × 61

First multiples

671 · 1,342 (double) · 2,013 · 2,684 · 3,355 · 4,026 · 4,697 · 5,368 · 6,039 · 6,710

Sums & aliquot sequence

As consecutive integers: 335 + 336 56 + 57 + … + 66 20 + 21 + … + 41

Aliquot sequence: 671 → 73 → 1 → 0 — terminates at zero

Representations

In words: six hundred seventy-one
Ordinal: 671st
Roman numeral: DCLXXI
Binary: 1010011111
Octal: 1237
Hexadecimal: 0x29F
Base64: Ap8=
One's complement: 64,864 (16-bit)

In other bases

ternary (3) 220212

quaternary (4) 22133

quinary (5) 10141

senary (6) 3035

septenary (7) 1646

nonary (9) 825

undecimal (11) 560

duodecimal (12) 47b

tridecimal (13) 3c8

tetradecimal (14) 35d

pentadecimal (15) 2eb

Historical numeral systems

Babylonian (base 60): 𒌋𒁹 𒌋𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺
Greek (Milesian): χοαʹ
Mayan (base 20): 𝋡·𝋭·𝋫
Chinese: 六百七十一
Chinese (financial): 陸佰柒拾壹

In other modern scripts

Eastern Arabic ٦٧١ Devanagari ६७१ Bengali ৬৭১ Tamil ௬௭௧ Thai ๖๗๑ Tibetan ༦༧༡ Khmer ៦៧១ Lao ໖໗໑ Burmese ၆၇၁

Digit at this position in famous constants

π — Pi (π): Digit 671 = 1
e — Euler's number (e): Digit 671 = 4
φ — Golden ratio (φ): Digit 671 = 0
√2 — Pythagoras's (√2): Digit 671 = 7
ln 2 — Natural log of 2: Digit 671 = 7
γ — Euler-Mascheroni (γ): Digit 671 = 3

Also seen as

Unicode codepoint

Latin Letter Small Capital L

U+029F

Lowercase letter (Ll)

UTF-8 encoding: CA 9F (2 bytes).

Lookup U+029F on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#00029F

RGB(0, 2, 159)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.2.159.

Address: 0.0.2.159
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.2.159

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

NANP area code 671

The number 671 is an active NANP area code (North American Numbering Plan).

Primary area: Statewide
Region: Guam
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 671 ↗