11775
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 21
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 19592
- Proper Divisor Sum (Aliquot Sum)
- 7817
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 6240
- Möbius Function
- 0
- Radical
- 2355
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 3
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
- 125
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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
- a(n) = prime(n)*(prime(n-1)-1)/2.at n=34A014302
- Least m such that if r and s in {1/1, 1/4, 1/9,..., 1/n^2} satisfy r < s, then r < k/m < s for some integer k.at n=31A024827
- Numbers whose set of base-14 digits is {1,4}.at n=26A032826
- Multiplicity of highest weight (or singular) vectors associated with character chi_24 of Monster module.at n=37A034412
- Sums of 12 distinct powers of 2.at n=15A038463
- Numerators of continued fraction convergents to sqrt(161).at n=9A041296
- Numerators of continued fraction convergents to sqrt(644).at n=9A042236
- a(n) = Sum_{k=1..n} lcm(k,n)/gcd(k,n).at n=28A056789
- Smallest integer > 1 which is both n-gonal and centered n-gonal.at n=26A072277
- Sum of terms in row n of A081520.at n=28A081519
- Numbers k such that f(k), f(k+1) and f(k+2) are all primes, where f(k) = 8*k^2 + 4*k + 1.at n=40A103777
- Numbers of unstrained alkane staggered conformers (acyclic). See Table 4 of Cyvin et al. reference for precise definition.at n=10A126879
- A sequence of asymptotic density zeta(10) - 1, where zeta is the Riemann zeta function.at n=11A143036
- Expansion of Product_{k > 0} (1 + A005229(k)*x^k).at n=24A147880
- a(n) = 512n - 1.at n=22A158011
- a(n) = 841*n + 1.at n=13A158404
- a(n) = 14*n^2 + 1.at n=28A158482
- a(n) = 46*n^2 - 1.at n=15A158634
- a(n) = n*(n^2 - 4*n + 5)/2.at n=30A162607
- A Fibonacci-Pascal triangle.at n=59A162745