801
The Class 801 runs on electricity but carries a diesel engine anyway.
- Odd
- Composite
Where 801 fits
Why 801 is special
The engine exists only to move the train off the electrified network in a failure, which is an unusual amount of dead weight to carry for a rare event.
Factors & digit properties
- Divisors (6)
- 1, 3, 9, 89, 267, 801
- Prime factorisation
- 3^2 × 89
- Digit sum
- 9
- Digital root
- 9
Representations
- Decimal
- 801
- Binary
- 1100100001
- Octal
- 1441
- Hexadecimal
- 321
- Roman numeral
- DCCCI
- Scientific notation
- 8.010 × 10^2
Other mathematical patterns
- Deficient number
- Harshad (Niven) number
- Lucky number (mathematical sieve)
Related numbers & connections
The 801 is the electric-only member of the family, carrying a diesel generator solely for the day the wires fail.
View 800 →Other connections
- is associated with800
why?
Strength 0.50, confidence "high".
Technology & computing
The British Rail Class 801 is an electric multiple unit fitted with a diesel generator intended for emergency movement rather than routine operation on unelectrified track.
DocumentedTechnology & computingGeography: United KingdomPeriod: 2018–
Common questions
Is 801 a prime number?
No, 801 is not prime.
What are the factors of 801?
The factors of 801 are 1, 3, 9, 89, 267, 801.
What is 801 in Roman numerals?
801 in Roman numerals is DCCCI.
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