11665
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 14004
- Proper Divisor Sum (Aliquot Sum)
- 2339
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 9328
- Möbius Function
- 1
- Radical
- 11665
- 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
- 81
- 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
- a(n) = 2*n^3 + 1.at n=18A033562
- Numbers n such that 259*2^n-1 is prime.at n=18A050888
- Numbers k such that k^8 == 1 (mod 9^3).at n=32A056084
- Average of squares of successive primes: a(n) = (prime(n+1)^2 + prime(n)^2)/2, with n >= 2.at n=26A075892
- Smallest squarefree integer k such that Q(sqrt(k)) has class number n.at n=29A081363
- Smallest d such that real quadratic field with discriminant d has class number n.at n=29A081364
- a(n) = 16*n^2 + 1.at n=26A108211
- Pierpont semiprimes: semiprimes of the form (2^K)*(3^L)+1.at n=29A113432
- Composite number of the form 4n^2+1.at n=35A121944
- Least semiprime composed of a square and a positive cube in n different ways.at n=3A122956
- Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 1), (0, 1, 0), (1, 0, 0), (1, 1, -1)}.at n=8A149966
- Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of n steps taken from {(-1, 0), (-1, 1), (0, -1), (0, 1), (1, 1)}.at n=8A151448
- a(n) = 324*n + 1.at n=35A158272
- a(n) = 729*n + 1.at n=15A158397
- a(n) = 36*n^2 + 1.at n=18A158591
- Sum of a positive square and a positive cube in at least three ways.at n=19A171385
- Parameters n for which the elliptic curve y^2=x^3+n has rank 4.at n=12A179124
- Values of the genus g for which there exists a compact Riemann surface of genus g admitting an automorphism group of order 84(g-1), the maximum possible, also known as the Hurwitz bound.at n=31A179982
- a(n) = 9*6^n+1.at n=4A199413
- Number of n X 2 arrays of the minimum value of corresponding elements and their horizontal or vertical neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..3 n X 2 array.at n=8A219367