1555
1555 is the year of the Peace of Augsburg.
- Odd
- Composite
Where 1555 fits
Why 1555 is special
It let each German prince choose Lutheranism or Catholicism for his territory — cuius regio, eius religio. Subjects had no choice, and the omission of Calvinism from the settlement helped cause the Thirty Years' War.
Same number, different meanings
How 1555 is understood across different contexts — never implying one meaning because of another.
- Mathematics
It let each German prince choose Lutheranism or Catholicism for his territory — cuius regio, eius religio. Subjects had no choice, and the omission of Calvinism from the settlement helped cause the Thirty Years' War.
- History
In 1555, the Peace of Augsburg allowed German princes to choose Lutheranism or Catholicism for their territories (Holy Roman Empire).
- Law & regulation
Augsburg settled religious conflict by letting each prince impose his confession on his territory. It was a peace between rulers rather than a grant of individual conscience, and its exclusion of Calvinism left the dispute to reopen in 1618.
1555 is part of
Factors & digit properties
- Divisors (4)
- 1, 5, 311, 1555
- Prime factorisation
- 5 × 311
- Digit sum
- 16
- Digital root
- 7
Representations
- Decimal
- 1555
- Scientific notation
- 1.555 × 10^3
Roman numerals
M D L V
Binary
1 1 0 0 0 0 1 0 0 1 1
1 × 1,024 + 1 × 512 + 0 × 256 + 0 × 128 + 0 × 64 + 0 × 32 + 1 × 16 + 0 × 8 + 0 × 4 + 1 × 2 + 1 × 1 = 1,555
Octal
3 0 2 3
3 × 512 + 0 × 64 + 2 × 8 + 3 × 1 = 1,555
Hexadecimal
6 1 3
6 × 256 + 1 × 16 + 3 × 1 = 1,555
Read as powers of two: 1,024 + 512 + 16 + 2 + 1 = 1,555.
In historical numeral systems
Egyptian
1 lotus, 5 coils of rope, 5 hobbles, 5 strokes
1 × 1,000 + 5 × 100 + 5 × 10 + 5 × 1 = 1,555. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
2 corner wedges + 5 vertical wedges (sixties place), 5 corner wedges + 5 vertical wedges (units place)
25 × 60 + 55 = 1555. Places are separated by a space on the tablet, with the higher place written first.
Systems that simply cannot reach this value are left out. Where a script needs a font most readers do not have, the reading is given instead of the glyphs — see number systems for each system in full.
Other mathematical patterns
- Deficient number
- Semiprime
Related numbers & connections
1555 is a year in the 16th century, in the 1550s.
The Peace of Augsburg in 1555 settled religion between princes and excluded Calvinism, which is part of why the Thirty Years' War began in 1618.
View 1618 →Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
Other connections
- developed from1618
why?
Strength 0.50, confidence "high".
History
In 1555, the Peace of Augsburg allowed German princes to choose Lutheranism or Catholicism for their territories (Holy Roman Empire).
DocumentedHistoryGeography: Holy Roman EmpirePeriod: 1555
Law & regulation
Augsburg settled religious conflict by letting each prince impose his confession on his territory. It was a peace between rulers rather than a grant of individual conscience, and its exclusion of Calvinism left the dispute to reopen in 1618.
DocumentedLaw & regulationGeography: Holy Roman EmpirePeriod: 1555
Common questions
Is 1555 a prime number?
No, 1555 is not prime.
What are the factors of 1555?
The factors of 1555 are 1, 5, 311, 1555.
What is 1555 in Roman numerals?
1555 in Roman numerals is MDLV.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026