122
122 is the year construction began on Hadrian's Wall.
- Even
- Composite
Where 122 fits
Why 122 is special
It ran 117 km across northern Britain and took about six years. Whether it was primarily military, a customs frontier or a statement of imperial limit is still argued.
Factors & digit properties
- Divisors (4)
- 1, 2, 61, 122
- Prime factorisation
- 2 × 61
- Digit sum
- 5
- Digital root
- 5
Representations
- Decimal
- 122
- Binary
- 1111010
- Octal
- 172
- Hexadecimal
- 7a
- Roman numeral
- CXXII
- Scientific notation
- 1.220 × 10^2
Other mathematical patterns
- Deficient number
- Semiprime
Related numbers & connections
Hadrian's Wall was begun in 122 as the northern limit of Roman Britain, and Rome itself was sacked in 410 — the frontier outlasted the confidence that built it by less than three centuries.
View 410 →Other connections
- is associated with410
why?
Strength 0.50, confidence "high".
History
Hadrian's Wall was built from 122 across the width of Britain. Its function — defence, taxation, or a declaration that the empire ended here — remains a live question among archaeologists.
DocumentedHistoryGeography: BritainPeriod: 122
Common questions
Is 122 a prime number?
No, 122 is not prime.
What are the factors of 122?
The factors of 122 are 1, 2, 61, 122.
What is 122 in Roman numerals?
122 in Roman numerals is CXXII.
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