141
E141 is the copper complex of chlorophyll.
- Odd
- Composite
Where 141 fits
Why 141 is special
Substituting copper for magnesium in the molecule makes the green stable, which is a chemical fix that also makes the additive synthetic in the public mind.
141 is part of
Factors & digit properties
- Divisors (4)
- 1, 3, 47, 141
- Prime factorisation
- 3 × 47
- Digit sum
- 6
- Digital root
- 6
Representations
- Decimal
- 141
- Scientific notation
- 1.410 × 10^2
Roman numerals
C X L I
CXLI uses the subtractive pair XL: ten before fifty — fifty minus ten.
Binary
1 0 0 0 1 1 0 1
1 × 128 + 0 × 64 + 0 × 32 + 0 × 16 + 1 × 8 + 1 × 4 + 0 × 2 + 1 × 1 = 141
Octal
2 1 5
2 × 64 + 1 × 8 + 5 × 1 = 141
Hexadecimal
8 d
8 × 16 + d × 1 = 141
Read as powers of two: 128 + 8 + 4 + 1 = 141.
In historical numeral systems
Egyptian
1 coil of rope, 4 hobbles, 1 stroke
1 × 100 + 4 × 10 + 1 × 1 = 141. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
2 vertical wedges (sixties place), 2 corner wedges + 1 vertical wedge (units place)
2 × 60 + 21 = 141. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
rho, then mu, then alpha, marked as a numeral
rho-mu-alpha + keraia
rho + mu + alpha written in descending order and added — the letters carry their values wherever they stand, so this is addition, not place value.
Hebrew numerals
qof, then mem, then alef
qof-mem-alef
qof (100) + mem (40) + alef (1) = 141, written in descending order.
Maya
1 bar + 2 dots (upper, twenties place) over 1 dot (lower, units place)
7 × 20 + 1 = 141. 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
- Palindromic number
- Deficient number
- Semiprime
- Lucky number (mathematical sieve)
Related numbers & connections
Replacing the central magnesium with copper is what makes the plant-derived green stable enough to use.
View 140 →Everyday life
E141 copper complexes of chlorophylls replace the central magnesium ion with copper, greatly improving stability to heat and acid compared with E140.
DocumentedEveryday lifeGeography: European Union and states adopting the E number systemPeriod: 1962–
Common questions
Is 141 a prime number?
No, 141 is not prime.
What are the factors of 141?
The factors of 141 are 1, 3, 47, 141.
What is 141 in Roman numerals?
141 in Roman numerals is CXLI. XL is subtractive: ten before fifty — fifty minus ten. Written additively it would be CXXXXI, 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: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 15 July 2026