1,555
1,555 is a composite number, odd, a calendar year.
1,555 (one thousand five hundred fifty-five) is an odd 4-digit number. It is a composite number with 4 divisors, and factors as 5 × 311. Written other ways, in Roman numerals it is MDLV and in binary, 11000010011.
Interestingness
Notable events — 1555 AD
- Sep 25 The Peace of Augsburg lets German princes choose between Lutheranism and Catholicism.
- Oct 16 Bishops Latimer and Ridley are burned at the stake in Oxford.
- Mar 5 Tobacco is introduced to Spain from the Americas.
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, 1555
- Ended on
-
Saturday
December 31, 1555
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
1550s
1550–1559
- Century
-
16th century
1501–1600
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
471
471 years before 2026.
In other calendars
- Hebrew
-
5315 / 5316 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
962 / 963 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Wood zodiac:Rabbit
Sexagenary cycle position 52 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2098 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
933 / 934 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1547 / 1548 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1477 / 1476 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 5 × 311
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√1,555 = [39; (2, 3, 3, 1, 6, 2, 2, 12, 1, 2, 1, 4, 1, 7, 1, 14, 1, 7, 1, 4, 1, 2, 1, 12, …)]
Period length 32 — the block in parentheses repeats forever.
Representations
- In words
- one thousand five hundred fifty-five
- Ordinal
- 1555th
- Roman numeral
- MDLV
- Binary
- 11000010011
- Octal
- 3023
- Hexadecimal
- 0x613
- Base64
- BhM=
- One's complement
- 63,980 (16-bit)
- Scientific notation
- 1.555 × 10³
- As a duration
- 1,555 s = 25 minutes, 55 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵αφνεʹ
- Mayan (base 20)
- 𝋣·𝋱·𝋯
- Chinese
- 一千五百五十五
- Chinese (financial)
- 壹仟伍佰伍拾伍
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,555 = 9
- e — Euler's number (e)
- Digit 1,555 = 5
- φ — Golden ratio (φ)
- Digit 1,555 = 0
- √2 — Pythagoras's (√2)
- Digit 1,555 = 1
- ln 2 — Natural log of 2
- Digit 1,555 = 2
- γ — Euler-Mascheroni (γ)
- Digit 1,555 = 2
Also seen as
UTF-8 encoding: D8 93 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.6.19.
- Address
- 0.0.6.19
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.6.19
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 1,555 Hz is closest to:
- Concert pitch (A4 = 440 Hz): G6 (1568 Hz, -14¢)
- Scientific pitch (C4 = 256 Hz): G6 (1534.3 Hz, +23¢)
- Baroque pitch (A4 = 415 Hz): G♯6 (1566.8 Hz, -13¢)
The digit sequence 1555 first appears in π at position 7,244 of the decimal expansion (the 7,244ordinal-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.
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.