11811
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 12
- Digital Root
- 3
- Palindromic Number
- yes
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 16384
- Proper Divisor Sum (Aliquot Sum)
- 4573
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 7560
- Möbius Function
- -1
- Radical
- 11811
- Omega Function (Ω)
- 3
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 143
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- Strobogrammatic numbers: the same upside down.at n=44A000787
- Numbers with mirror symmetry about middle.at n=22A006072
- Gaussian binomial coefficient [n, 3] for q = 2.at n=4A006096
- Gaussian binomial coefficient [n, 4] for q = 2.at n=3A006097
- Gaussian binomial coefficient [ n, n/2 ] for q=2.at n=7A006099
- Triangle of Gaussian binomial coefficients (or q-binomial coefficients) [n,k] for q = 2.at n=32A022166
- Triangle of Gaussian binomial coefficients (or q-binomial coefficients) [n,k] for q = 2.at n=31A022166
- Expansion of Molien series for 5-dimensional group G_3 acting on Jacobi polynomials of ternary self-dual codes.at n=4A027628
- Palindromic lucky numbers.at n=30A031161
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 72.at n=29A031570
- Lucky numbers that are both palindromic and nonprime.at n=24A031880
- Number of sublattices of index n in generic 4-dimensional lattice.at n=15A038991
- Number of sublattices of index n in generic 5-dimensional lattice.at n=7A038992
- Base 10 palindromes that start with 1.at n=40A043036
- Numbers having four 1's in base 10.at n=27A043496
- Composite palindromes whose sum of prime factors is palindromic (counted with multiplicity).at n=19A046354
- Numbers that are a product of distinct Mersenne primes (elements of A000668).at n=14A046528
- a(n) = period of x^n + x + 1 over GF(2), i.e., the smallest integer m>0 such that x^n + x + 1 divides x^m + 1 over GF(2).at n=13A046932
- Integers whose sum of divisors is a 7th power.at n=3A048257
- Vertically symmetric numbers.at n=44A053701