1,618
1,618 is a composite number, even, a calendar year.
Notable events — 1618 AD
- May 23 The Defenestration of Prague sparks the Thirty Years' War.
- Oct 29 Sir Walter Raleigh is executed in England.
- Sep 14 Kepler publishes the third of his laws of planetary motion.
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
-
Monday
January 1, 1618
- Ended on
-
Monday
December 31, 1618
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Easter Sunday
-
April 15
Sunday, April 15, 1618
- Decade
-
1610s
1610–1619
- Century
-
17th century
1601–1700
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
408
408 years before 2026.
In other calendars
- Hebrew
-
5378 / 5379 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1027 / 1028 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Earth zodiac:Horse
Sexagenary cycle position 55 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2161 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
996 / 997 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1610 / 1611 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1540 / 1539 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 16
- Digit product
- 48
- Digital root
- 7
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 8,161
- Flips to (rotate 180°)
- 8,191
- Recamán's sequence
- a(716) = 1,618
- Square (n²)
- 2,617,924
- Cube (n³)
- 4,235,801,032
- Divisor count
- 4
- σ(n) — sum of divisors
- 2,430
- φ(n) — Euler's totient
- 808
- Sum of prime factors
- 811
Primality
Prime factorization: 2 × 809
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand six hundred eighteen
- Ordinal
- 1618th
- Roman numeral
- MDCXVIII
- Binary
- 11001010010
- Octal
- 3122
- Hexadecimal
- 0x652
- Base64
- BlI=
- One's complement
- 63,917 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵αχιηʹ
- Mayan (base 20)
- 𝋤·𝋠·𝋲
- Chinese
- 一千六百一十八
- Chinese (financial)
- 壹仟陸佰壹拾捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,618 = 9
- e — Euler's number (e)
- Digit 1,618 = 5
- φ — Golden ratio (φ)
- Digit 1,618 = 2
- √2 — Pythagoras's (√2)
- Digit 1,618 = 2
- ln 2 — Natural log of 2
- Digit 1,618 = 2
- γ — Euler-Mascheroni (γ)
- Digit 1,618 = 4
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1618, here are decompositions:
- 5 + 1613 = 1618
- 11 + 1607 = 1618
- 17 + 1601 = 1618
- 47 + 1571 = 1618
- 59 + 1559 = 1618
- 107 + 1511 = 1618
- 131 + 1487 = 1618
- 137 + 1481 = 1618
Showing the first eight; more decompositions exist.
UTF-8 encoding: D9 92 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.6.82.
- Address
- 0.0.6.82
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.6.82
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1618 first appears in π at position 6,004 of the decimal expansion (the 6,004ordinal-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.