1,689
1,689 is a composite number, odd, a calendar year.
Notable events — 1689 AD
- Feb 13 William and Mary accept the English Crown with the Declaration of Right.
- Dec 16 The English Bill of Rights becomes law.
- Sep 7 Russia and China sign the Treaty of Nerchinsk.
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
- 52
- Started on
-
Saturday
January 1, 1689
- Ended on
-
Saturday
December 31, 1689
- Friday the 13ths
-
1
One Friday the 13th this year.
- Easter Sunday
-
April 10
Sunday, April 10, 1689
- Decade
-
1680s
1680–1689
- Century
-
17th century
1601–1700
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
337
337 years before 2026.
In other calendars
- Hebrew
-
5449 / 5450 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1100 / 1101 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Earth zodiac:Snake
Sexagenary cycle position 6 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2232 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1067 / 1068 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1681 / 1682 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1611 / 1610 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Odd
- Digit count
- 4
- Digit sum
- 24
- Digit product
- 432
- Digital root
- 6
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 9,861
- Flips to (rotate 180°)
- 6,891
- Recamán's sequence
- a(946) = 1,689
- Square (n²)
- 2,852,721
- Cube (n³)
- 4,818,245,769
- Divisor count
- 4
- σ(n) — sum of divisors
- 2,256
- φ(n) — Euler's totient
- 1,124
- Sum of prime factors
- 566
Primality
Prime factorization: 3 × 563
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand six hundred eighty-nine
- Ordinal
- 1689th
- Roman numeral
- MDCLXXXIX
- Binary
- 11010011001
- Octal
- 3231
- Hexadecimal
- 0x699
- Base64
- Bpk=
- One's complement
- 63,846 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵αχπθʹ
- Mayan (base 20)
- 𝋤·𝋤·𝋩
- Chinese
- 一千六百八十九
- Chinese (financial)
- 壹仟陸佰捌拾玖
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,689 = 2
- e — Euler's number (e)
- Digit 1,689 = 8
- φ — Golden ratio (φ)
- Digit 1,689 = 7
- √2 — Pythagoras's (√2)
- Digit 1,689 = 4
- ln 2 — Natural log of 2
- Digit 1,689 = 9
- γ — Euler-Mascheroni (γ)
- Digit 1,689 = 4
Also seen as
UTF-8 encoding: DA 99 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.6.153.
- Address
- 0.0.6.153
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.6.153
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1689 first appears in π at position 17,926 of the decimal expansion (the 17,926ordinal-suffix:th 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.