11218
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 13
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 17280
- Proper Divisor Sum (Aliquot Sum)
- 6062
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 5460
- Möbius Function
- -1
- Radical
- 11218
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 112
- 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
- yes
- Odd
- no
Appears in sequences
- Denominators of continued fraction convergents to sqrt(546).at n=9A042045
- Numbers whose base-7 representation contains exactly four 4's.at n=23A043412
- Expansion of chi(x) / phi(x^2) in powers of x where phi(), chi() are Ramanujan theta functions.at n=45A085261
- Antidiagonal sums of array A099597.at n=9A099598
- a(n) = a(n-1) + a(n-3) + a(n-4), n >= 4, with initial terms 2,5,4,7.at n=18A111570
- Numbers n such that n^24 + 1 = p*q with p,q distinct primes.at n=20A119982
- Expansion of Product_{k>0} (1-k^2*x^k)^(-1/k).at n=13A151954
- Number of binary strings of length n with no substrings equal to 0001 0010 or 1010.at n=14A164449
- Integers whose binary digits "1" define, if sorted into a quadrant shape whose right angle lies in a Go board corner, same colored Go stones that surely live all, but not if any stone is omitted.at n=18A166537
- Number of right triangles on a (n+1)X8 grid.at n=9A189812
- Numbers n such that n^8 + 1 and (n + 2)^8 + 1 are both prime.at n=29A217972
- Growth series for affine Coxeter group (or affine Weyl group) D_4.at n=25A266759
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 1006", based on the 5-celled von Neumann neighborhood.at n=29A273861
- Number of n X 3 0..2 arrays with no element equal to more than one of its king-move neighbors and with new values introduced in order 0 sequentially upwards.at n=8A280854
- Sum of the digit sums of the n-th powers of the first n positive integers.at n=45A287894
- Expansion of (1 - x^2)*Product_{k>=2} (1 + x^k)^k.at n=21A303902
- Sum of the prime parts in the partitions of n into 4 parts.at n=47A309465
- Number of strict compositions of n with alternating parts strictly decreasing.at n=39A342343
- Number of integer compositions of n whose maximal runs R all satisfy length(R) >= first(R).at n=26A389509