1
domain: N
Properties
Digital Properties
- Digit Count
- 1
- Digit Sum
- 1
- Digital Root
- 1
- Palindromic Number
- yes
- Repdigit
- yes
- Automorphic
- yes
- Kaprekar Number
- yes
- Multiplicative Persistence
- 0
Divisibility
- Divisor Count
- 1
- Divisor Sum
- 1
- Proper Divisor Sum (Aliquot Sum)
- 0
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 1
- Möbius Function
- 1
- Radical
- 1
- Omega Function (Ω)
- 0
- Little Omega Function (ω)
- 0
Special
- Factorial
- yes
- Catalan Number
- yes
- Bell Number
- yes
- Motzkin Number
- yes
- Primorial
- yes
Figurate Numbers
- Fibonacci Number
- yes
- Triangular Number
- yes
- Perfect Square
- yes
- Perfect Cube
- yes
- Pentagonal Number
- yes
- Hexagonal Number
- yes
- Lucas Number
- yes
- Tetrahedral Number
- yes
- Pell Number
- yes
- Tribonacci Number
- yes
- Pronic Number
- no
Recreational
- Happy Number
- yes
- Harshad Number
- yes
- Narcissistic Number
- yes
- Collatz Steps
- 0
- Smith Number
- no
Classification
- Natural
- yes
- Even
- no
- Odd
- yes
Primality
- Prime
- no
- Composite Number
- no
- Semiprime
- no
- Squarefree Number
- yes
- Prime Power
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- yes
- Achilles Number
- yes
- Perfect Power
- no
- Smooth Number
- yes
- Carmichael Number
- no
Names
- German
- eins· ordinal: erste
- English
- one· ordinal: first
- Spanish
- uno· ordinal: primero
- French
- un· ordinal: premier
- Italian
- uno· ordinal: primo
- Latin
- unus· ordinal: primus
- Portuguese
- um· ordinal: primeiro
Appears in sequences
- Number of groups of order n.at n=1A000001
- Number of groups of order n.at n=2A000001
- Number of groups of order n.at n=3A000001
- Number of groups of order n.at n=5A000001
- Number of groups of order n.at n=7A000001
- Number of groups of order n.at n=11A000001
- Number of groups of order n.at n=13A000001
- Number of groups of order n.at n=15A000001
- Number of groups of order n.at n=17A000001
- Number of groups of order n.at n=19A000001
- Number of groups of order n.at n=23A000001
- Number of groups of order n.at n=29A000001
- Number of groups of order n.at n=31A000001
- Number of groups of order n.at n=33A000001
- Number of groups of order n.at n=35A000001
- Number of groups of order n.at n=37A000001
- Number of groups of order n.at n=41A000001
- Number of groups of order n.at n=43A000001
- Number of groups of order n.at n=47A000001
- Number of groups of order n.at n=51A000001