1925
1925 is the year of the Scopes trial over teaching evolution.
- Odd
- Composite
Where 1925 fits
Why 1925 is special
A Tennessee teacher was tried for teaching evolution in a state school, convicted, and fined a hundred dollars on a verdict later overturned on a technicality. The law itself stayed in force until 1967.
1925 connects to:
- historical years — appears in
- 1894 — contrasts with
Same number, different meanings
How 1925 is understood across different contexts — never implying one meaning because of another.
- Mathematics
A Tennessee teacher was tried for teaching evolution in a state school, convicted, and fined a hundred dollars on a verdict later overturned on a technicality. The law itself stayed in force until 1967.
- History
In 1925, Heisenberg set out matrix mechanics, the first complete formulation of quantum mechanics (Germany).
- Law & regulation
A Tennessee teacher was convicted of teaching evolution and fined a hundred dollars, on a verdict later overturned on a technicality. The statute itself remained in force until 1967, which is the part the trial's fame tends to obscure.
1925 is part of
Factors & digit properties
- Divisors (12)
- 1, 5, 7, 11, 25, 35, 55, 77, 175, 275, 385, 1925
- Prime factorisation
- 5^2 × 7 × 11
- Digit sum
- 17
- Digital root
- 8
Representations
- Decimal
- 1925
- Scientific notation
- 1.925 × 10^3
Roman numerals
M C M X X V
MCMXXV uses the subtractive pair CM: a hundred before a thousand — a thousand minus a hundred.
Binary
1 1 1 1 0 0 0 0 1 0 1
1 × 1,024 + 1 × 512 + 1 × 256 + 1 × 128 + 0 × 64 + 0 × 32 + 0 × 16 + 0 × 8 + 1 × 4 + 0 × 2 + 1 × 1 = 1,925
Octal
3 6 0 5
3 × 512 + 6 × 64 + 0 × 8 + 5 × 1 = 1,925
Hexadecimal
7 8 5
7 × 256 + 8 × 16 + 5 × 1 = 1,925
Read as powers of two: 1,024 + 512 + 256 + 128 + 4 + 1 = 1,925.
In historical numeral systems
Egyptian
1 lotus, 9 coils of rope, 2 hobbles, 5 strokes
1 × 1,000 + 9 × 100 + 2 × 10 + 5 × 1 = 1,925. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
3 corner wedges + 2 vertical wedges (sixties place), 5 vertical wedges (units place)
32 × 60 + 5 = 1925. Places are separated by a space on the tablet, with the higher place written first.
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
Related numbers & connections
1925 is a year in the 20th century, in the 1920s.
The Dreyfus conviction of 1894 rested on forged evidence the army concealed; the Scopes trial of 1925 tested a law openly. Both became arguments about the state's relationship to truth.
View 1894 →Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
Other connections
- contrasts with1894
why?
Strength 0.50, confidence "high".
History
In 1925, Heisenberg set out matrix mechanics, the first complete formulation of quantum mechanics (Germany).
DocumentedHistoryGeography: GermanyPeriod: 1925
Law & regulation
A Tennessee teacher was convicted of teaching evolution and fined a hundred dollars, on a verdict later overturned on a technicality. The statute itself remained in force until 1967, which is the part the trial's fame tends to obscure.
DocumentedLaw & regulationGeography: United StatesPeriod: 1925
Common questions
Is 1925 a prime number?
No, 1925 is not prime.
What are the factors of 1925?
The factors of 1925 are 1, 5, 7, 11, 25, 35, 55, 77, 175, 275, 385, 1925.
What is 1925 in Roman numerals?
1925 in Roman numerals is MCMXXV. CM is subtractive: a hundred before a thousand — a thousand minus a hundred. Written additively it would be MDCCCCXXV, 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