2271
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 12
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 3032
- Proper Divisor Sum (Aliquot Sum)
- 761
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 1512
- Möbius Function
- 1
- Radical
- 2271
- Omega Function (Ω)
- 2
- Little Omega Function (ω)
- 2
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- no
- Perfect Square
- no
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 63
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- Squarefree Number
- yes
- Prime Power
- no
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- The generalized Conway-Guy sequence w^{1}.at n=13A006755
- Coordination sequence T1 for Zeolite Code AFG.at n=33A008012
- Coordination sequence T2 for Zeolite Code HEU.at n=31A008117
- Coordination sequence T2 for Zeolite Code NON.at n=29A008213
- Powers of sqrt(22) rounded up.at n=5A017972
- Powers of fourth root of 22 rounded up.at n=10A018110
- Coordination sequence T2 for Zeolite Code CGF.at n=33A019452
- Numbers k such that Fibonacci(k) == -2 (mod k).at n=35A023163
- Convolution of A001950 and A014306.at n=44A023669
- a(n) = Sum_{i=1..floor((n+1)/4)} a(2*i-1) * a(n-2*i+1), with a(1)=a(2)=1 and a(3)=3.at n=14A024725
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 30.at n=27A031528
- Lucky numbers with size of gaps equal to 14 (upper terms).at n=11A031897
- Base 3 digits are, in order, the first n terms of the periodic sequence with initial period 1,0,0.at n=7A033139
- a(0)=2; a(n) is the smallest k > a(n-1) such that the fractional part of k^(1/9) starts with n.at n=36A034074
- Concatenations C1 and C2 are both prime (see the comment lines).at n=37A034815
- Base 9 digits are, in order, the first n terms of the periodic sequence with initial period 3,1,0.at n=3A037665
- Sums of 3 distinct powers of 3.at n=42A038465
- Numerators of continued fraction convergents to sqrt(95).at n=6A041170
- Denominators of continued fraction convergents to sqrt(207).at n=8A041385
- Denominators of continued fraction convergents to sqrt(828).at n=6A042599