1585
1585 is the year of the Roanoke colony's first settlement attempt.
- Odd
- Composite
Where 1585 fits
Why 1585 is special
The later 1587 settlement vanished entirely, leaving the word CROATOAN carved on a post. What happened remains unresolved, and is one of the most durable unsolved questions in colonial American history.
Factors & digit properties
- Divisors (4)
- 1, 5, 317, 1585
- Prime factorisation
- 5 × 317
- Digit sum
- 19
- Digital root
- 1
Representations
- Decimal
- 1585
- Binary
- 11000110001
- Octal
- 3061
- Hexadecimal
- 631
- Roman numeral
- MDLXXXV
- Scientific notation
- 1.585 × 10^3
Other mathematical patterns
- Deficient number
- Semiprime
- Lucky number (mathematical sieve)
Related numbers & connections
Roanoke was attempted from 1585 and vanished; Jamestown was founded in 1607 and survived on tobacco. English settlement in North America succeeded on the second attempt.
View 1607 →Other connections
- is associated with1607
why?
Strength 0.50, confidence "high".
History
The English settlement at Roanoke was found abandoned in 1590 with a single carved word and no bodies. Assimilation with local peoples is the most common explanation and none is established.
DocumentedHistoryGeography: North CarolinaPeriod: 1585–1590
Common questions
Is 1585 a prime number?
No, 1585 is not prime.
What are the factors of 1585?
The factors of 1585 are 1, 5, 317, 1585.
What is 1585 in Roman numerals?
1585 in Roman numerals is MDLXXXV.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 3 August 2026