15544
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 16
- Divisor Sum
- 30600
- Proper Divisor Sum (Aliquot Sum)
- 15056
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 7392
- Möbius Function
- 0
- Radical
- 3886
- Omega Function (Ω)
- 5
- 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
- 40
- 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
- yes
- Odd
- no
Appears in sequences
- Absolute value of Glaisher's alpha(n).at n=25A002290
- Fibonacci numbers written in base 6.at n=18A004689
- Even 9-gonal (or enneagonal) numbers.at n=33A028992
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 23 ones.at n=9A031791
- a(n) = (2*n+1)*(7*n+1).at n=33A033572
- Numbers k such that the decimal part of k^(1/8) starts with a 'nine digits' anagram.at n=5A034283
- a(n) = (n+2)^(n+3) - n^(n+1).at n=3A060375
- A Wallis pair (x,y) satisfies sigma(x^2) = sigma(y^2); sequence gives x's for indecomposable Wallis pairs with x < y (ordered by values of x).at n=37A075768
- A Wallis pair (x,y) satisfies sigma(x^2) = sigma(y^2); sequence gives x's for indecomposable Wallis pairs with x < y (ordered by values of x).at n=38A075768
- Number of positions of the 15-puzzle at a distance of n moves from an initial state with the empty square in one of the corners, in the single-tile metric.at n=13A089484
- a(n) = A079137(n)/2.at n=7A123936
- Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 1, -1), (0, 1, 1), (1, 0, 0), (1, 0, 1)}.at n=7A151082
- Parameters n for which the elliptic curve y^2=x^3-n has rank 4.at n=19A179137
- Monotonic ordering of nonnegative differences 5^i-3^j, for 40>=i>=0, j>=0.at n=29A192150
- Monotonic ordering of nonnegative differences 5^i-9^j, for 40>= i>=0, j>=0.at n=16A192199
- a(n) = Sum_{i=0..n} digsum(i)^3, where digsum(i) = A007953(i).at n=40A231688
- Number of (n+1) X (4+1) 0..2 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 2 (constant-stress 1 X 1 tilings).at n=7A234262
- Absolute discriminants of complex quadratic fields with 3-class rank 2.at n=11A242862
- Absolute discriminants of complex quadratic fields with 3-class group of elementary abelian type (3,3) of rank 2.at n=7A242863
- Absolute discriminants of complex quadratic fields with 3-class group of type (3,3) and Hilbert 3-class field tower of exact length 3, except for the cases mentioned in the COMMENTS.at n=1A242878