15501
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 12
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 20672
- Proper Divisor Sum (Aliquot Sum)
- 5171
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 10332
- Möbius Function
- 1
- Radical
- 15501
- Omega Function (Ω)
- 2
- 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
- 53
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- 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
- Cyclotomic polynomials at x=5.at n=18A019323
- Cyclotomic polynomials at x=-5.at n=9A020504
- a(n) = n^6 - n^3 + 1.at n=5A060891
- a(n) = 16*n^2 + 4*n + 1.at n=31A082041
- Starting positions of strings of three 7's in the decimal expansion of Pi.at n=15A083631
- a(n) = sigma_6(n^2)/sigma_3(n^2).at n=4A084220
- The (1,4) entry in the matrix M^n, where M is the 4 X 4 matrix [[0,-1,1,0],[0,0,-1,1],[1,1,1,0],[0,1,1,1]].at n=21A122822
- Numbers k such that k^3 divides 5^(k^2) + 1.at n=7A128679
- (L)-sieve transform of A004767 = {3,7,11,15,...,4n-1,...}.at n=30A155167
- Parameters n for which the elliptic curve y^2=x^3+n has rank 4.at n=20A179124
- Number of n X 2 binary arrays with each element equal to either the sum mod 2 of its horizontal and vertical neighbors or the sum mod 2 of its diagonal and antidiagonal neighbors.at n=11A183510
- Numbers n such that the greatest prime divisor p of n^2+1 has the property that (p - n)^2 + 1 = p.at n=44A206246
- Number of 6's in the last section of the set of partitions of n.at n=48A206556
- Fibonacci-Zumkeller numbers: a(n)=n if n<=3, otherwise the smallest number >= a(n-2) + a(n-1) having at least one common factor with a(n-2), but none with a(n-1).at n=18A249357
- Intersection of A002061 and A016105.at n=29A370519