Numberwise

25

25 is a perfect square (5²) and marks a silver jubilee — the traditional 25th-anniversary milestone.

2 confirmed records · 1 sourceChecked, general knowledgeHow we qualify claimsReport a correction

Where 25 fits

Where 25 fits: Mathematics, Technology, Related numbersMathematics: Perfect square, Powerful number, Automorphic number, Semiprime, Lucky number (mathematical sieve). Technology: Film and video frame-rate standards. Related numbers: 5, 50, 75.MathematicsPerfect squarePowerful numberAutomorphic numberSemiprimeTechnologyFilm and video frame-rate s…Related numbers5507525
25 connects to 3 worlds: mathematics, technology, related numbers.

Why 25 is special

25's mathematical identity (5²) and its everyday role as a quarter (of 100, of a dollar, of a century) make it one of the most practically useful square numbers.

25 is part of

Square numbersNumbers in film and televisionNumbers around us

Factors & digit properties

Divisors (3)
1, 5, 25
Prime factorisation
5^2
Digit sum
7
Digital root
7

Representations

Decimal
25
Binary
11001
Octal
31
Hexadecimal
19
Roman numeral
XXV
Scientific notation
2.500 × 10^1

Other mathematical patterns

Related numbers & connections

Mathematical relationship
5 is a factor of 25 (5 × 5 = 25).

5 is a factor of 25 (5 × 5 = 25).

View 5 →
Documented appearance
25 frames per second is the standard broadcast frame rate in PAL-region television (a 50Hz-derived system).

25 frames per second is the standard broadcast frame rate in PAL-region television (a 50Hz-derived system).

Mathematically related

  • has factor5
    why?

    Strength 0.50, confidence "high".

  • is a factor of50
    why?

    Strength 0.50, confidence "high".

  • is a factor of75
    why?

    Strength 0.50, confidence "high".

Numbers Around Us

  • appears inFilm and video frame-rate standards
    why?

    Strength 0.50, confidence "high".

How is 25 connected to another number? →

Culture

  • A 25th wedding anniversary is traditionally called a "silver" anniversary in the Western anniversary-naming convention.

    Widely documentedCultureGeography: Western/English-speaking traditions

  • A 25th wedding anniversary is traditionally called a "silver" anniversary in the Western anniversary-naming convention.

    Widely documentedCultureGeography: Western/English-speaking traditions

Common questions

Is 25 a prime number?

No, 25 is not prime.

What are the factors of 25?

The factors of 25 are 1, 5, 25.

What is 25 in Roman numerals?

25 in Roman numerals is XXV.

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