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Zahl

3

3 — Three

3 is a prime, odd, a calendar year.

Three is the second prime, the first odd prime, and the first Mersenne prime ((2^2 - 1)). It is also the second triangular number.

Quellen https://en.wikipedia.org/wiki/3
Cousin Prime Curated Deficient Number Fibonacci Harshad / Niven Lucas Mersenne Prime Narcissistic / Armstrong Prime Recamán's Sequence Squarefree Triangular Twin Prime

Eigenschaften

Parität
Ungerade
Stellenanzahl
1
Quersumme
3
Iterierte Quersumme
3
Palindrom
Ja
Recamán-Folge
a(2) = 3
Anzahl der Teiler
2
σ(n) — Summe der Teiler
4

Primzahleigenschaft

3 is prime. It has exactly two divisors: 1 and itself.

Teiler und Vielfache

All divisors (2)
1 · 3
Aliquot sum (sum of proper divisors): 1
Factor pairs (a × b = 3)
1 × 3
First multiples
3 · 6 · 9 · 12 · 15 · 18 · 21 · 24 · 27 · 30

Darstellungen

In Worten
three
Ordinal
3rd
Römische Zahl
III
Binär
11
Oktal
3
Hexadezimal
0x3
Base64
Aw==

Auch zu sehen als

Prime neighborhood

Adjacent primes:

  • Previous prime: 2 (gap of 1)
  • Next prime: 5 (gap of 2)

Pair status: twin with 5.

ASCII character

As an ASCII codepoint, 3 is control character (0x03). ASCII control character.

Hex color
#000003
RGB(0, 0, 3)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.3.

Address
0.0.0.3
Class
reserved
IPv4-mapped IPv6
::ffff:0.0.0.3

Unspecified address (0.0.0.0/8) — "this network" placeholder.