11515
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
- 3
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 16416
- Proper Divisor Sum (Aliquot Sum)
- 4901
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 7728
- Möbius Function
- 0
- Radical
- 1645
- Omega Function (Ω)
- 4
- 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
- no
- 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
- Generalized Stirling numbers, [n+8,8]_4.at n=3A001719
- Pisot sequence E(8,10), a(n) = floor( a(n-1)^2/a(n-2) + 1/2 ).at n=29A010916
- a(n) = a(n-1) + a(n-3), with a(0) = a(1) = 1, a(2) = 5.at n=23A011761
- Number of terms in 5th derivative of a function composed with itself n times.at n=19A022815
- Distinct odd elements in 4-Pascal triangle A028275 (by row).at n=40A028281
- Odd elements (greater than 1) to right of central elements in 4-Pascal triangle A028275.at n=40A028287
- Number of 6-ary rooted trees with n nodes and height exactly 4.at n=18A036642
- Denominators of continued fraction convergents to sqrt(23).at n=11A041037
- Denominators of continued fraction convergents to sqrt(92).at n=11A041165
- Denominators of continued fraction convergents to sqrt(207).at n=11A041385
- Denominators of continued fraction convergents to sqrt(368).at n=5A041697
- Numbers k such that k and k+1 have the same sum of unitary divisors (A034448).at n=27A064125
- a(n) = x is the smallest number such that gcd(prime(x)+1, x) = n.at n=48A084314
- p such that p^4 + q^4 = r^4 + s^4 = a(n).at n=36A088728
- Numbers k such that k and k^2 use only the digits 1, 2, 3, 5 and 9.at n=23A136977
- Unsigned 4-Stirling numbers of the first kind.at n=32A143493
- Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 5 ones in any 5 X 5 X 5 subtriangle.at n=14A153946
- y-values in the solution to x^2 - 23*y^2 = 1.at n=3A174767
- a(n) = 2*Farey(m; I) - 1 where m = Fibonacci (n + 1) and I = [1/n, 1].at n=10A176502
- Number of (n+2) X 3 binary arrays with each 3 X 3 subblock having rows and columns in lexicographically nondecreasing order.at n=30A184540