47
47 is a prime number, the atomic number of silver, and sits directly before the perfect square 49.
- Odd
- Prime
Where 47 fits
Why 47 is special
47's ordinary primality is its main mathematical feature; its clearest real-world identity is as silver's atomic number.
47 is part of
Factors & digit properties
- Divisors (2)
- 1, 47
- Prime factorisation
- 47
- Digit sum
- 11
- Digital root
- 2
Representations
- Decimal
- 47
- Binary
- 101111
- Octal
- 57
- Hexadecimal
- 2f
- Roman numeral
- XLVII
- Scientific notation
- 4.700 × 10^1
Other mathematical patterns
- Deficient number
- Lucas number
- Safe prime
Related numbers & connections
47 is a factor of 94 (47 × 2 = 94).
View 94 →Mathematically related
- is a factor of94
why?
Strength 0.50, confidence "high".
Science
47 is the atomic number of silver.
DocumentedScience
Mathematics
47 is prime — the 15th prime number — sitting directly before the perfect square 49.
DocumentedMathematics
Common questions
Is 47 a prime number?
Yes, 47 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 47?
The factors of 47 are 1, 47.
What is 47 in Roman numerals?
47 in Roman numerals is XLVII.
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