1143
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 9
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 1664
- Proper Divisor Sum (Aliquot Sum)
- 521
- 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
- 756
- Möbius Function
- 0
- Radical
- 381
- Omega Function (Ω)
- 3
- 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
- yes
- Narcissistic Number
- no
- Collatz Steps
- 31
- 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
- no
- Odd
- yes
Appears in sequences
- Powers of rooted tree enumerator.at n=8A000439
- Expansion of (1+x^3)/((1-x)*(1-x^2)^2*(1-x^3)).at n=32A001973
- Divisors of 2^42 - 1.at n=19A003547
- Primes written in base 5.at n=39A004679
- Crystal ball sequence for planar net 3.6.3.6.at n=22A008580
- Number of 3 X 3 symmetric stochastic matrices under row and column permutations.at n=40A008764
- Number of immersions of oriented circle into oriented sphere with n double points.at n=6A008986
- Coordination sequence T4 for Zeolite Code CON.at n=24A009871
- Expansion of Product_{k>=1} (1 - x^k)^11.at n=22A010819
- Numbers k that divide s(k), where s(1)=1, s(j)=19*s(j-1)+j.at n=12A014869
- Integers k such that k divides 22^k - 1.at n=24A014959
- Positive integers n such that 2^n (mod n) == 2^9 (mod n).at n=53A015931
- Powers of fifth root of 15 rounded up.at n=13A018158
- Numbers k such that the continued fraction for sqrt(k) has period 16.at n=49A020355
- a(n) = n*(7*n + 1)/2.at n=18A022265
- a(n) = a(n-1) + c(n-1) for n >= 2, a( ) increasing, given a(1)=6; where c( ) is complement of a( ).at n=42A022938
- a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (Lucas numbers), t = (composite numbers).at n=12A024471
- a(n) = Sum_{k=1..n} k*floor( prime(k)/k ).at n=27A024927
- Index of 6^n within the sequence of the numbers of the form 6^i*10^j.at n=53A025719
- Index of 8^n within the sequence of the numbers of the form 3^i*8^j (A025615).at n=34A025728