2681
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 3072
- Proper Divisor Sum (Aliquot Sum)
- 391
- 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
- 2292
- Möbius Function
- 1
- Radical
- 2681
- 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
- 45
- 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
- Coordination sequence T2 for Zeolite Code DOH.at n=32A008079
- Coordination sequence T1 for Zeolite Code AHT.at n=35A009866
- Integers that are squarefree and also the sum of first k squarefrees for some k.at n=34A013932
- Coordination sequence T2 for Zeolite Code TER.at n=35A016434
- Coordination sequence T6 for Zeolite Code TER.at n=35A016438
- Numbers k such that the continued fraction for sqrt(k) has period 40.at n=13A020379
- Fibonacci sequence beginning 1, 18.at n=12A022108
- Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 19 (most significant digit on right).at n=22A029512
- Coordination sequence T1 for Zeolite Code TSC.at n=43A033616
- a(1) = 2; a(n) is smallest number >= a(n-1) such that the juxtaposition a(1)a(2)...a(n) is a prime.at n=32A033679
- Number of binary codes of length 12 with n words.at n=4A034197
- Number of binary codes (not necessarily linear) of length n with 4 words.at n=11A034199
- Coordination sequence T1 for Zeolite Code STT.at n=34A038428
- Denominators of continued fraction convergents to sqrt(222).at n=6A041415
- Numbers n such that string 0,8 occurs in the base 9 representation of n but not of n-1.at n=35A044259
- Numbers n such that string 8,1 occurs in the base 10 representation of n but not of n-1.at n=28A044413
- Numbers k such that string 0,8 occurs in the base 9 representation of k but not of k+1.at n=35A044640
- Numbers n such that string 6,0 occurs in the base 9 representation of n but not of n+1.at n=36A044686
- Numbers n such that string 8,1 occurs in the base 10 representation of n but not of n+1.at n=28A044794
- Numbers whose base-3 representation contains exactly four 0's and three 2's.at n=25A045012