2015
2015 is the year of the Paris Agreement.
- Odd
- Composite
Where 2015 fits
Why 2015 is special
Nearly every country agreed to limit warming to well below two degrees, with targets each set for itself and no enforcement mechanism. That design is why it achieved universal participation and why its sufficiency is disputed.
Same number, different meanings
How 2015 is understood across different contexts — never implying one meaning because of another.
- Mathematics
Nearly every country agreed to limit warming to well below two degrees, with targets each set for itself and no enforcement mechanism. That design is why it achieved universal participation and why its sufficiency is disputed.
- History
In 2015, the Paris Agreement on climate change was adopted.
- Law & regulation
Nearly every country signed the Paris Agreement, each setting its own targets with no enforcement mechanism. That design is precisely why participation is universal and why whether it is sufficient remains disputed.
2015 is part of
Factors & digit properties
- Divisors (8)
- 1, 5, 13, 31, 65, 155, 403, 2015
- Prime factorisation
- 5 × 13 × 31
- Digit sum
- 8
- Digital root
- 8
Representations
- Decimal
- 2015
- Scientific notation
- 2.015 × 10^3
Roman numerals
M M X V
Binary
1 1 1 1 1 0 1 1 1 1 1
1 × 1,024 + 1 × 512 + 1 × 256 + 1 × 128 + 1 × 64 + 0 × 32 + 1 × 16 + 1 × 8 + 1 × 4 + 1 × 2 + 1 × 1 = 2,015
Octal
3 7 3 7
3 × 512 + 7 × 64 + 3 × 8 + 7 × 1 = 2,015
Hexadecimal
7 d f
7 × 256 + d × 16 + f × 1 = 2,015
Read as powers of two: 1,024 + 512 + 256 + 128 + 64 + 16 + 8 + 4 + 2 + 1 = 2,015.
In historical numeral systems
Egyptian
2 lotuses, 1 hobble, 5 strokes
2 × 1,000 + 1 × 10 + 5 × 1 = 2,015. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
3 corner wedges + 3 vertical wedges (sixties place), 3 corner wedges + 5 vertical wedges (units place)
33 × 60 + 35 = 2015. 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
2015 is a year in the 21st century, in the 2010s.
The Paris Agreement of 2015 lets each state set its own targets and achieved universal participation; earlier binding approaches did not. Enforceability and participation traded against each other.
View 1997 →History
In 2015, the Paris Agreement on climate change was adopted.
DocumentedHistoryGeography: globalPeriod: 2015
Law & regulation
Nearly every country signed the Paris Agreement, each setting its own targets with no enforcement mechanism. That design is precisely why participation is universal and why whether it is sufficient remains disputed.
DocumentedLaw & regulationGeography: International — parties to the agreementPeriod: 2015
Common questions
Is 2015 a prime number?
No, 2015 is not prime.
What are the factors of 2015?
The factors of 2015 are 1, 5, 13, 31, 65, 155, 403, 2015.
What is 2015 in Roman numerals?
2015 in Roman numerals is MMXV.
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