15041
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 11
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 16470
- Proper Divisor Sum (Aliquot Sum)
- 1429
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 13728
- Möbius Function
- 0
- Radical
- 1157
- Omega Function (Ω)
- 3
- Little Omega Function (ω)
- 2
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
- 89
- 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
- Powers of fourth root of 13 rounded down.at n=15A018081
- Powers of fourth root of 13 rounded to nearest integer.at n=15A018082
- Indices of triangular numbers which are also octagonal.at n=4A046182
- Numbers k such that 27*2^k-1 is prime.at n=32A050539
- Numbers n for which there are exactly five k such that n = k + reverse(k).at n=32A072429
- a(n) = round(10000*log(n/10)).at n=44A104077
- a(n) = A152800(n+2,2n+1) for n>=0.at n=7A152802
- Numerator of Hermite(n, 1/8).at n=5A159014
- Positive numbers y such that y^2 is of the form x^2+(x+89)^2 with integer x.at n=10A160055
- Number of -n..n arrays x(0..3) of 4 elements with zero sum and no element more than one greater than the previous.at n=37A199848
- Number of 5 X n 0..1 arrays with antidiagonals unimodal and rows and diagonals nondecreasing.at n=14A224041
- Numbers n such that 3*T(n)+1 is a square, where T = A000217.at n=9A233450
- Numbers k such that k!6 + 36 is prime, where k!6 is the sextuple factorial number (A085158 ).at n=27A288449
- Numbers k such that both k and k+2 are de Polignac numbers (A006285).at n=21A330284
- a(n) = (n+1)^4 written in base n.at n=5A362445
- Index of first occurrence of n in A390514.at n=6A390534