Number

1,671

1,671 is a composite number, odd, a calendar year.

Arithmetic Number Deficient Number Evil Number Recamán's Sequence Self Number Semiprime Squarefree Year

Notable events — 1671 AD

Jan 28 Henry Morgan sacks Panama City.
May 9 Colonel Blood attempts to steal the Crown Jewels.
Aug 19 France lays the cornerstone of the new Versailles palace.

Events compiled from Wikipedia ↗ · Licensed CC BY-SA 4.0

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, 1671
Ended on: Thursday
December 31, 1671
Friday the 13ths: 3
3 Friday the 13ths this year.
Easter Sunday: March 29
Sunday, March 29, 1671
Decade: 1670s
1670–1679
Century: 17th century
1601–1700
Millennium: 2nd millennium
1001–2000
Years ago: 355
355 years before 2026.

In other calendars

Hebrew: 5431 / 5432 AM
Rosh Hashanah falls in September/October.
Islamic Hijri: 1081 / 1082 AH
Lunar calendar; year spans differ from Gregorian.
Chinese: Year of the zodiac:Metal zodiac:Pig
Sexagenary cycle position 48 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 2214 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Persian Solar Hijri: 1049 / 1050 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
Ethiopian: 1663 / 1664 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 1593 / 1592 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 4
Digit sum: 15
Digit product: 42
Digital root: 6
Palindrome: No
Bit width: 11 bits
Reversed: 1,761
Recamán's sequence: a(810) = 1,671
Square (n²): 2,792,241
Cube (n³): 4,665,834,711
Divisor count: 4
σ(n) — sum of divisors: 2,232
φ(n) — Euler's totient: 1,112
Sum of prime factors: 560

Primality

Prime factorization: 3 × 557

Nearest primes: 1,669 (−2) · 1,693 (+22)

Divisors & multiples

All divisors (4)

1 · 3 · 557 · 1671

Aliquot sum (sum of proper divisors): 561

Factor pairs (a × b = 1,671)

1 × 1671

3 × 557

First multiples

1,671 · 3,342 (double) · 5,013 · 6,684 · 8,355 · 10,026 · 11,697 · 13,368 · 15,039 · 16,710

Sums & aliquot sequence

As consecutive integers: 835 + 836 556 + 557 + 558 276 + 277 + 278 + 279 + 280 + 281

Aliquot sequence: 1,671 → 561 → 303 → 105 → 87 → 33 → 15 → 9 → 4 → 3 → 1 → 0 — terminates at zero

Representations

In words: one thousand six hundred seventy-one
Ordinal: 1671st
Roman numeral: MDCLXXI
Binary: 11010000111
Octal: 3207
Hexadecimal: 0x687
Base64: Boc=
One's complement: 63,864 (16-bit)

In other bases

ternary (3) 2021220

quaternary (4) 122013

quinary (5) 23141

senary (6) 11423

septenary (7) 4605

nonary (9) 2256

undecimal (11) 128a

duodecimal (12) b73

tridecimal (13) 9b7

tetradecimal (14) 875

pentadecimal (15) 766

Historical numeral systems

Babylonian (base 60): 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹
Egyptian hieroglyphic: 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺
Greek (Milesian): ͵αχοαʹ
Mayan (base 20): 𝋤·𝋣·𝋫
Chinese: 一千六百七十一
Chinese (financial): 壹仟陸佰柒拾壹

In other modern scripts

Eastern Arabic ١٦٧١ Devanagari १६७१ Bengali ১৬৭১ Tamil ௧௬௭௧ Thai ๑๖๗๑ Tibetan ༡༦༧༡ Khmer ១៦៧១ Lao ໑໖໗໑ Burmese ၁၆၇၁

Digit at this position in famous constants

π — Pi (π): Digit 1,671 = 7
e — Euler's number (e): Digit 1,671 = 4
φ — Golden ratio (φ): Digit 1,671 = 5
√2 — Pythagoras's (√2): Digit 1,671 = 7
ln 2 — Natural log of 2: Digit 1,671 = 1
γ — Euler-Mascheroni (γ): Digit 1,671 = 3

Also seen as

Unicode codepoint

Arabic Letter Tcheheh

U+0687

Other letter (Lo)

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

Lookup U+0687 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#000687

RGB(0, 6, 135)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.6.135.

Address: 0.0.6.135
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.6.135

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

Position in π

The digit sequence 1671 first appears in π at position 1,182 of the decimal expansion (the 1,182ordinal-suffix:nd digit after the integer 3).

Search range: the first 1,000,000 fractional digits of π. Any 6-digit-or-shorter string is virtually guaranteed to appear in there — the more interesting signal is the position.

Look up 1671 on Pi Search ↗