11881
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
- 3
Divisibility
- Divisor Count
- 3
- Divisor Sum
- 11991
- Proper Divisor Sum (Aliquot Sum)
- 110
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 11772
- Möbius Function
- 0
- Radical
- 109
- Omega Function (Ω)
- 2
- 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
- yes
- 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
- 99
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- Squarefree Number
- no
- Prime Power
- yes
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- yes
- Achilles Number
- no
- Perfect Power
- yes
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Squares of primes.at n=28A001248
- Centered 12-gonal numbers, or centered dodecagonal numbers: numbers of the form 6*k*(k-1) + 1.at n=44A003154
- Star numbers (A003154) that are squares.at n=2A006061
- a(n) = (3*n+1)^2.at n=36A016778
- a(n) = (4*n + 1)^2.at n=27A016814
- a(n) = (5*n + 4)^2.at n=21A016898
- a(n) = (6*n + 1)^2.at n=18A016922
- a(n) = (7*n + 4)^2.at n=15A017030
- a(n) = (8*n + 5)^2.at n=13A017126
- a(n) = (9*n + 1)^2.at n=12A017174
- a(n) = (10*n + 9)^2.at n=10A017378
- a(n) = (11*n + 10)^2.at n=9A017510
- a(n) = (12*n + 1)^2.at n=9A017534
- Squares using at most two distinct digits, not ending in 0.at n=17A018884
- Squares using no more than two distinct digits.at n=22A018885
- a(n) is the smallest square that is the sum of n distinct positive squares.at n=31A018936
- Pseudoprimes to base 96.at n=36A020224
- Strong pseudoprimes to base 96.at n=10A020322
- Squares of (odd numbers not divisible by 5).at n=43A028375
- Prime powers with special exponents: q^(p-1) where p > 2 and q are prime numbers.at n=36A036454