9185
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 23
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 12096
- Proper Divisor Sum (Aliquot Sum)
- 2911
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 6640
- Möbius Function
- -1
- Radical
- 9185
- 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
- no
- Narcissistic Number
- no
- Collatz Steps
- 184
- 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
- Convolution of primes with themselves.at n=18A014342
- Positive numbers having the same set of digits in base 7 and base 9.at n=43A037439
- Square pyramorphic numbers: integers m such that the sum of the first m squares (A000330) ends in m.at n=24A093534
- a(n) = n-th prime * n-th nonprime.at n=38A127118
- Products of 3 distinct safe primes.at n=22A157354
- a(n) = (11*n^2 + 19*n + 10)/2.at n=40A160749
- Count of interior bounded regions in a regular 2n-sided polygon dissected by all diagonals parallel to sides.at n=13A165217
- Parameters k for which the Tate-Shafarevich group Ш of the elliptic curve y^2=x^3-k has order 36.at n=3A179138
- a(n) = 12*n^2 - 8*n + 1.at n=28A185212
- Number of -2..2 arrays x(i) of n+1 elements i=1..n+1 with x(i)+x(j), x(i+1)+x(j+1), -(x(i)+x(j+1)), and -(x(i+1)+x(j)) having one or three distinct values for every i<=n and j<=n.at n=8A211460
- Maximum deviation from n in Collatz trajectory of n.at n=46A213538
- Number of (n+3) X (3+3) 0..1 arrays with each row and column divisible by 15, read as a binary number with top and left being the most significant bits.at n=7A262452
- T(n,k)=Number of (n+3)X(k+3) 0..1 arrays with each row and column divisible by 15, read as a binary number with top and left being the most significant bits.at n=47A262457
- T(n,k)=Number of (n+3)X(k+3) 0..1 arrays with each row and column divisible by 15, read as a binary number with top and left being the most significant bits.at n=52A262457
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 547", based on the 5-celled von Neumann neighborhood.at n=20A272840
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 609", based on the 5-celled von Neumann neighborhood.at n=20A273210
- Number of palindromic compositions of n into prime parts.at n=51A276420
- Number of partitions of n with up to three distinct kinds of 1.at n=32A320690
- Number T(n,k) of entries in the k-th cycles of all permutations of [n] when cycles are ordered by decreasing lengths (and increasing smallest elements); triangle T(n,k), n>=1, 1<=k<=n, read by rows.at n=31A322384
- Number of entries in the fourth cycles of all permutations of [n] when cycles are ordered by decreasing lengths.at n=4A332853