11681
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 11682
- Proper Divisor Sum (Aliquot Sum)
- 1
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 11680
- Möbius Function
- -1
- Radical
- 11681
- Omega Function (Ω)
- 1
- Little Omega Function (ω)
- 1
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
- 68
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- yes
- Composite Number
- no
- Semiprime
- no
- Squarefree Number
- yes
- Prime Power
- yes
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 1402
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Number of 3-colored labeled graphs on n nodes, divided by 3.at n=4A000685
- Numbers k such that the continued fraction for sqrt(k) has period 59.at n=16A020398
- Smallest nonempty set S containing prime divisors of 6k+7 for each k in S.at n=48A020604
- Numbers k that divide the (left) concatenation of all numbers <= k written in base 11 (most significant digit on left).at n=22A029480
- Numbers k such that k^4 can be written as a sum of four positive 4th powers with no common factor.at n=38A039664
- Primes resulting from procedure described in A048388.at n=23A048389
- Primes p such that the decimal digits of p^2 can be partitioned into two or more nonzero squares.at n=29A048646
- Primes that yield a different prime when rotated by 180 degrees.at n=35A048890
- a(n) = a(n-1) + the number of primes <= a(n-1).at n=42A061535
- Primes that are still primes when turned upsided down.at n=39A080788
- Diagonal of A088262.at n=32A088263
- Primes p of the form 2*prime(k) + 3 such that 2*prime(k+1) + 3 is the next prime after p.at n=27A089528
- Smallest prime of the form 1 followed by a perfect power.at n=8A089773
- Leading diagonal of triangle A093922.at n=40A093923
- Primes of the form 64n+33.at n=41A105128
- Primes for which the weight as defined in A117078 is 9 and the gap as defined in A001223 is 8.at n=37A118922
- Primes in the sequence A003294 of certain fourth powers bases.at n=6A134820
- Father primes of order 5.at n=40A136074
- Primes of the form 24x^2+24xy+41y^2.at n=39A139995
- Numbers k such that (k,k+8) forms a pair of consecutive primes ending respectively in 1 and 9.at n=30A141026