9183
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 21
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 12248
- Proper Divisor Sum (Aliquot Sum)
- 3065
- 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
- 6120
- Möbius Function
- 1
- Radical
- 9183
- 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
- 171
- 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
- [ exp(3/5)*n! ].at n=6A030971
- Number of partitions of n with equal nonzero number of parts congruent to each of 2 and 3 (mod 4).at n=44A035551
- Engel expansion of Sum_{k>=0} 1/(7 + k)^k.at n=11A063190
- a(n) is the smallest k such that (k^3 + 1)/(n^3 + 1) is an integer > 1.at n=39A065964
- Number of sets of positive integers with arithmetic mean n.at n=7A066571
- CONTINUANT transform of {sigma(n)}, 1, 3, 4, 7, 6, 12, ... (A000203).at n=5A071138
- Semiprimes p such that next semiprime after p is p + 10.at n=33A217030
- Numbers m such that T(m)^2 + T(m^2) is a perfect square, where T = A000217.at n=4A239450
- a(n) = 3*B*C*(n mod A) + 5*A*C*(n mod B) + 2*A*B*(n mod C) with A=7, B=11, C=17.at n=19A256668
- Integers k such that A086167(k) and A086168(k) are both prime.at n=40A270563
- a(n) = 591*2^n - 273.at n=4A278131
- Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-1) + 2, where a(0) = 1, a(1) = 2, b(0) = 3, and (a(n)) and (b(n)) are increasing complementary sequences.at n=15A294543
- Number of unlabeled rooted trees with n vertices such that every branch of the root has a different number of leaves.at n=12A298535
- Number of partitions in all twice partitions of n where the second partition is strict.at n=15A327554
- Numbers k >= 3 such that 1/d(k - 2) + 1/d(k - 1) + 1/d(k) is an integer, d(i) = A000005(i).at n=47A359056
- Expansion of e.g.f. 2*exp(-x) / (3 - exp(2*x)).at n=6A368454