9381
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
- 8
- Divisor Sum
- 12960
- Proper Divisor Sum (Aliquot Sum)
- 3579
- 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
- 6032
- Möbius Function
- -1
- Radical
- 9381
- 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
- 153
- 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
- Crystal ball sequence for A_4 lattice.at n=7A008384
- Number of ordered quadruples of integers from [ 2,n ] with no global factor.at n=20A015638
- Boustrophedon transform of 1 followed by Thue-Morse sequence A001285.at n=8A029885
- Coefficient array for certain polynomials N(5; k,x) (rising powers in x).at n=17A062986
- Perrin sequence of order 5.at n=59A087935
- Binomial transform of A166242.at n=11A166452
- Starting from a(1)=1, a(n) is the minimum integer greater than a(n-1) such that a(n)+a(n-1), a(n)*a(n-1)+1 and a(n)*a(n-1)-1 are all primes.at n=42A228590
- Sum of all proper divisors of all positive integers <= prime(n).at n=39A244576
- The 360 degree spoke (or ray) of a hexagonal spiral of Ulam.at n=28A244803
- a(n) = 8n^2 - 12n + 1.at n=33A273220
- a(n) = 2*A090495(n) - 1.at n=16A274297
- Partial sums of A080670.at n=48A287881
- Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-2) + 3, where a(0) = 1, a(1) = 3, b(0) = 2, b(1) = 4.at n=15A293058
- Numbers k such that all digits in k are different and for each digit d it is true that k = d (mod sum of digits(k) - d).at n=19A306788
- Number of prime parts in the partitions of n into 9 parts.at n=37A309438
- Number of nX6 0..1 arrays with every element unequal to 0, 2, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=7A318421
- Fixed points of A345352.at n=44A345362
- Numbers k such that A361338(k) = 8.at n=19A361347
- Number of noncrossing partitions of the n-set with some pair of singletons {i} and {j} that can be merged into {i,j} and leave the partition a noncrossing-partition.at n=10A363449