105
105 is the police emergency number in Peru.
- Odd
- Composite
Where 105 fits
Why 105 is special
105 is a reminder that emergency numbering is national, not natural. Peru routes police to 105 while its neighbours use 911, 133 or 123, so a traveller crossing a land border in South America changes emergency number as often as currency. Peru also runs 116 for fire and 106 for ambulance.
105 connects to:
- emergency telephone numbers — is used by
- 110 — contrasts with
Same number, different meanings
How 105 is understood across different contexts — never implying one meaning because of another.
- Mathematics
105 is a reminder that emergency numbering is national, not natural. Peru routes police to 105 while its neighbours use 911, 133 or 123, so a traveller crossing a land border in South America changes emergency number as often as currency. Peru also runs 116 for fire and 106 for ambulance.
- Science
The 1997 resolution distributed element names between the competing laboratories. Dubnium, berkelium and californium mean the periodic table records a Cold War scientific rivalry and its negotiated end.
- Geography
Peru reaches police on 105 while several neighbouring countries use different digits entirely. Regional blocs have generally added a shared number alongside national ones rather than replacing them, which is the same pattern the European Union followed.
105 is part of
Factors & digit properties
- Divisors (8)
- 1, 3, 5, 7, 15, 21, 35, 105
- Prime factorisation
- 3 × 5 × 7
- Digit sum
- 6
- Digital root
- 6
Representations
- Decimal
- 105
- Binary
- 1101001
- Octal
- 151
- Hexadecimal
- 69
- Roman numeral
- CV
- Scientific notation
- 1.050 × 10^2
Other mathematical patterns
- Triangular number
- Deficient number
- Lucky number (mathematical sieve)
Related numbers & connections
105 reaches police in Peru, one of many national assignments that never converged.
Two national police numbers that never converged, which is the normal situation rather than the exception.
View 110 →Numbers Around Us
- is used byEmergency telephone numbers
why?
Strength 0.50, confidence "high".
Other connections
- contrasts with110
why?
Strength 0.50, confidence "high".
Science
The 1997 resolution distributed element names between the competing laboratories. Dubnium, berkelium and californium mean the periodic table records a Cold War scientific rivalry and its negotiated end.
DocumentedScience
Geography
Peru reaches police on 105 while several neighbouring countries use different digits entirely. Regional blocs have generally added a shared number alongside national ones rather than replacing them, which is the same pattern the European Union followed.
DocumentedGeographyGeography: PeruPeriod: 20th century–Peru routes police to 105, fire to 116 and ambulance to 106. Its neighbours use different numbers again — 911 in some, 133 or 123 in others — so a traveller moving through South America changes emergency number about as often as currency. Nothing about the digits is inherent; each is an administrative choice.
DocumentedGeographyGeography: Peru
Common questions
Is 105 a prime number?
No, 105 is not prime.
What are the factors of 105?
The factors of 105 are 1, 3, 5, 7, 15, 21, 35, 105.
What is 105 in Roman numerals?
105 in Roman numerals is CV.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 3 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 3 August 2026