number.wiki
Nombre

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.

Sources 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

Propriétés

Parité
Impair
Nombre de chiffres
1
Somme des chiffres
3
Racine numérique
3
Palindrome
Oui
Suite de Recamán
a(2) = 3
Nombre de diviseurs
2
σ(n) — somme des diviseurs
4

Primalité

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

Diviseurs et multiples

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

Représentations

En lettres
three
Ordinal
3rd
Chiffre romain
III
Binaire
11
Octal
3
Hexadécimal
0x3
Base64
Aw==

Aussi vu comme

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.