11487
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
- 8
- Divisor Sum
- 17536
- Proper Divisor Sum (Aliquot Sum)
- 6049
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 6552
- Möbius Function
- -1
- Radical
- 11487
- 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
- yes
- Narcissistic Number
- no
- Collatz Steps
- 81
- 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
- Numbers k that divide s(k), where s(1)=1, s(j)=9*s(j-1)+j.at n=38A014857
- a(n) = n*(13*n + 1)/2.at n=42A022271
- Expansion of e.g.f. sin(x)*sin(sinh(x))/2 (even powers only).at n=7A024230
- Super-4 Numbers (4 * n^4 contains substring '4444' in its decimal expansion).at n=7A032744
- a(n) = (9*n^4 + 4*n^3 - n)/2.at n=7A047786
- a(n) is smallest number such that number of primes produced according to rules stipulated in Honaker's A048853 is n.at n=17A050662
- a(n) = (7*3^n + 2n + 5)/4.at n=8A103177
- Numbers k such that k^2+4, k^2+8, and k^2+10 are prime.at n=13A157929
- Number of 2X5 integer matrices with each row summing to zero, row elements in nondecreasing order, rows in lexicographically nondecreasing order, and the sum of squares of the elements <= 2*n^2 (number of collections of 2 zero-sum 5-vectors with total modulus squared not more than 2*n^2, ignoring vector and component permutations).at n=6A192700
- Alternating sums of powers of 1,2,...,6, divided by 3.at n=6A198629
- Numbers m such that there are precisely 7 groups of order m.at n=37A249550
- Where records occur in A209252.at n=10A276694
- a(n) = 2*a(n-1) + a(n-2) - 4*a(n-3) + 2*a(n-4) + a(n-5) -2*a(n-6) + a(n-7) for n >= 7, a(0) = 2, a(1) = 4, a(2) = 7, a(3) = 11, a(4) = 18, a(5) = 30, a(6) = 47.at n=19A289077
- Numbers k such that (44*10^k - 413)/9 is prime.at n=17A294374
- Numbers missing from A317415.at n=19A317417
- Number of unlabeled minimally rigid graphs in 3D on n vertices.at n=6A328419
- a(n) is the number of interior points over all Motzkin polyominoes of length n.at n=7A369360