83
83 is a prime number and the atomic number of bismuth — long assumed stable until 2003 measurements found it extremely weakly radioactive.
- Odd
- Prime
Where 83 fits
Why 83 is special
83's element, bismuth, is a genuine case of scientific correction: its 'stable' status held for over a century before precise measurement overturned it, though its half-life still vastly exceeds the age of the universe.
83 is part of
Factors & digit properties
- Divisors (2)
- 1, 83
- Prime factorisation
- 83
- Digit sum
- 11
- Digital root
- 2
Representations
- Decimal
- 83
- Binary
- 1010011
- Octal
- 123
- Hexadecimal
- 53
- Roman numeral
- LXXXIII
- Scientific notation
- 8.300 × 10^1
Other mathematical patterns
- Deficient number
- Sophie Germain prime
- Safe prime
Related numbers & connections
83 and 82 are consecutive integers.
View 82 →Nearby in a sequence
- is adjacent to82
why?
Strength 0.50, confidence "high".
Science
83 is the atomic number of bismuth, long assumed completely stable until 2003 measurements found it to be extremely weakly radioactive, with a half-life far longer than the age of the universe.
DocumentedScience
Mathematics
83 is prime — the 23rd prime number.
DocumentedMathematics
Common questions
Is 83 a prime number?
Yes, 83 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 83?
The factors of 83 are 1, 83.
What is 83 in Roman numerals?
83 in Roman numerals is LXXXIII.
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