97
97 is a prime number — the largest two-digit prime — and the atomic number of berkelium.
- Odd
- Prime
Where 97 fits
Why 97 is special
97's status as the largest two-digit prime makes it a small landmark: the last prime before the three-digit numbers begin.
97 is part of
Factors & digit properties
- Divisors (2)
- 1, 97
- Prime factorisation
- 97
- Digit sum
- 16
- Digital root
- 7
Representations
- Decimal
- 97
- Scientific notation
- 9.700 × 10^1
Roman numerals
X C V I I
XCVII uses the subtractive pair XC: ten before a hundred — a hundred minus ten.
Binary
1 1 0 0 0 0 1
1 × 64 + 1 × 32 + 0 × 16 + 0 × 8 + 0 × 4 + 0 × 2 + 1 × 1 = 97
Octal
1 4 1
1 × 64 + 4 × 8 + 1 × 1 = 97
Hexadecimal
6 1
6 × 16 + 1 × 1 = 97
Read as powers of two: 64 + 32 + 1 = 97.
In historical numeral systems
Egyptian
9 hobbles, 7 strokes
9 × 10 + 7 × 1 = 97. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 vertical wedge (sixties place), 3 corner wedges + 7 vertical wedges (units place)
1 × 60 + 37 = 97. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
koppa, then zeta, marked as a numeral
koppa-zeta + keraia
koppa + zeta written in descending order and added — the letters carry their values wherever they stand, so this is addition, not place value.
Hebrew numerals
tsadi, then zayin
tsadi-zayin
tsadi (90) + zayin (7) = 97, written in descending order.
Chinese numerals
jiǔ shí qī
jiǔ shí qī
九 before 十 multiplies it: 9 tens. 七 after it adds 7. The written form mirrors the arithmetic — "jiǔ shí qī". The financial (anti-fraud) form is 玖拾柒.
Maya
4 dots (upper, twenties place) over 3 bars + 2 dots (lower, units place)
4 × 20 + 17 = 97. Places stack vertically with the smallest at the bottom, so the upper group is worth twenty times the lower.
Systems that simply cannot reach this value are left out. Where a script needs a font most readers do not have, the reading is given instead of the glyphs — see number systems for each system in full.
Other mathematical patterns
- Deficient number
- Happy number
Related numbers & connections
97 and 96 are consecutive integers.
View 96 →Nearby in a sequence
- is adjacent to96
why?
Strength 0.50, confidence "high".
Science
97 is the atomic number of berkelium, named for the University of California, Berkeley, where it was first synthesised in 1949 — one of a cluster of elements named after that laboratory.
DocumentedScience
Mathematics
97 is prime — the largest two-digit prime number.
DocumentedMathematics
Common questions
Is 97 a prime number?
Yes, 97 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 97?
The factors of 97 are 1, 97.
What is 97 in Roman numerals?
97 in Roman numerals is XCVII. XC is subtractive: ten before a hundred — a hundred minus ten. Written additively it would be LXXXXVII, which Roman inscriptions used freely — the strict subtractive form is a later convention.
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