3511
3,511 is the second and largest known Wieferich prime.
- Odd
- Prime
Where 3511 fits
Why 3511 is special
No third has been found despite exhaustive computer search. It is unusual for a property to have exactly two known examples and no proof that the list is complete.
3511 is part of
Factors & digit properties
- Divisors (2)
- 1, 3511
- Prime factorisation
- 3511
- Digit sum
- 10
- Digital root
- 1
Representations
- Decimal
- 3511
- Binary
- 110110110111
- Octal
- 6667
- Hexadecimal
- db7
- Roman numeral
- MMMDXI
- Scientific notation
- 3.511 × 10^3
Other mathematical patterns
- Deficient number
Mathematics
3,511 is the larger of the only two known Wieferich primes. Mathematicians do not know whether there are finitely many, infinitely many, or exactly two — a rare state for a well-studied property.
DocumentedMathematics
Common questions
Is 3511 a prime number?
Yes, 3511 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 3511?
The factors of 3511 are 1, 3511.
What is 3511 in Roman numerals?
3511 in Roman numerals is MMMDXI.
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