Numberwise

2005

2005 is the year YouTube launched.

2 confirmed records · 2 sourcesChecked and sourcedChecked, general knowledgeHow we qualify claimsReport a correction

Where 2005 fits

Where 2005 fits: Mathematics, History, Related numbersMathematics: Semiprime. History: Historical years. Related numbers: 2007, 1975.MathematicsSemiprimeHistoryHistorical yearsRelated numbers200719752005
2005 connects to 3 worlds: mathematics, history, related numbers.

Why 2005 is special

It was founded as a video dating site and pivoted when people uploaded everything else. Being bought by Google the following year for $1.65 billion made it the standard reference point for internet acquisition value.

2005 connects to:

  • historical years — appears in
  • 2007 — appears alongside
  • 1975 — contrasts with

Same number, different meanings

How 2005 is understood across different contexts — never implying one meaning because of another.

2005 is part of

Numbers around us

Factors & digit properties

Divisors (4)
1, 5, 401, 2005
Prime factorisation
5 × 401
Digit sum
7
Digital root
7

Representations

Decimal
2005
Scientific notation
2.005 × 10^3

Roman numerals

M M V

Binary

1 1 1 1 1 0 1 0 1 0 1

1 × 1,024 + 1 × 512 + 1 × 256 + 1 × 128 + 1 × 64 + 0 × 32 + 1 × 16 + 0 × 8 + 1 × 4 + 0 × 2 + 1 × 1 = 2,005

Octal

3 7 2 5

3 × 512 + 7 × 64 + 2 × 8 + 5 × 1 = 2,005

Hexadecimal

7 d 5

7 × 256 + d × 16 + 5 × 1 = 2,005

Read as powers of two: 1,024 + 512 + 256 + 128 + 64 + 16 + 4 + 1 = 2,005.

In historical numeral systems

Egyptian

2 lotuses, 5 strokes

2 × 1,000 + 5 × 1 = 2,005. 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), 2 corner wedges + 5 vertical wedges (units place)

33 × 60 + 25 = 2005. 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

Related numbers & connections

Documented appearance
2005 is a year in the 21st century, in the 2000s.

2005 is a year in the 21st century, in the 2000s.

Connection
Kodak built a digital camera in 1975 and shelved it; YouTube launched in 2005 and was bought within a year. Two opposite responses to a technology that threatened an existing business.

Kodak built a digital camera in 1975 and shelved it; YouTube launched in 2005 and was bought within a year. Two opposite responses to a technology that threatened an existing business.

View 1975 →

Numbers Around Us

  • appears inHistorical years
    why?

    Strength 0.50, confidence "high".

  • appears alongside2007
    why?

    Strength 0.50, confidence "high".

Other connections

  • contrasts with1975
    why?

    Strength 0.50, confidence "high".

How is 2005 connected to another number? →

History

  • In 2005, YouTube was founded, accelerating online video.

    DocumentedHistoryGeography: globalPeriod: 2005

Media & popular culture

  • YouTube launched in 2005 as a video dating service and changed course when users uploaded everything except dating profiles. Google's $1.65 billion purchase the following year became the standard reference point for internet acquisition value.

    DocumentedMedia & popular culturePeriod: 2005

Common questions

Is 2005 a prime number?

No, 2005 is not prime.

What are the factors of 2005?

The factors of 2005 are 1, 5, 401, 2005.

What is 2005 in Roman numerals?

2005 in Roman numerals is MMV.

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