1211
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 5
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 1392
- Proper Divisor Sum (Aliquot Sum)
- 181
- 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
- 1032
- Möbius Function
- 1
- Radical
- 1211
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 70
- 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
- Describe the previous term (in base 3)!.at n=3A001388
- a(n) = n^2 written in base 3.at n=7A001738
- Expansion of 1/((1+x)*(1-x)^6).at n=9A001753
- Primes written in base 4.at n=25A004678
- Primes written in base 5.at n=41A004679
- Look and Say sequence: describe the previous term! (method A - initial term is 1).at n=3A005150
- a(n) = Sum_{k=0..n} C(n-k,4*k).at n=14A005676
- Positions of remoteness 3 in Beans-Don't-Talk.at n=21A005695
- Odd numbers not of form p + 2^k (de Polignac numbers).at n=22A006285
- Number of stable forests with n nodes.at n=12A006544
- Numbers in base 3.at n=49A007089
- Integers written in factorial base.at n=39A007623
- Number of independent polynomial invariants of symmetric matrix of order n.at n=7A007719
- Summarize the previous term! (in decreasing order).at n=3A007890
- Numbers that contain only 1's and 2's. Nonempty binary strings of length n in lexicographic order.at n=18A007931
- Numbers that contain only 1's, 2's and 3's.at n=48A007932
- Coordination sequence T1 for Zeolite Code AFI.at n=24A008014
- Coordination sequence T1 for Zeolite Code -CHI.at n=22A009846
- Coordination sequence T4 for Zeolite Code VET.at n=21A009905
- a(n) = floor(binomial(n,4)/4).at n=20A011850