5618
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 8589
- Proper Divisor Sum (Aliquot Sum)
- 2971
- 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
- 2756
- Möbius Function
- 0
- Radical
- 106
- 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
- no
- Narcissistic Number
- no
- Collatz Steps
- 160
- 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
- yes
- Odd
- no
Appears in sequences
- Numbers that are the sum of 4 positive 6th powers.at n=23A003360
- Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite RSN = RUB-17 K4Na12[Zn8Si28O72].18H2O starting with a T1 atom.at n=12A019220
- Numbers k such that the continued fraction for sqrt(k) has period 19.at n=36A020358
- a(n) = sum of the numbers between the two n's in A026358.at n=38A026361
- Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted then there are a pair of central terms both equal to 8.at n=8A031421
- Number of partitions satisfying cn(0,5) < cn(2,5) + cn(3,5).at n=30A039841
- Numbers whose base-5 representation contains exactly three 3's and two 4's.at n=15A045306
- Numbers k that divide 9^k + 5^k.at n=7A045598
- Number of orbits of length n under the map whose periodic points are counted by A001643.at n=18A060168
- Dimension of the space of weight n cuspidal newforms for Gamma_1( 100 ).at n=35A063373
- Numbers k such that d(k) + d(k+1) + d(k+2) = 8, where d(k) = A001223.at n=27A064026
- Number of inequivalent (ordered) solutions to n^2 = sum of 7 squares of integers >= 0.at n=41A065461
- Smallest of four consecutive integers divisible by four consecutive primes respectively.at n=33A072555
- Let x(0),...,x(n), be an additive chain of length n+1 with x(0)=1 and satisfying x(k) = x(k-1) + x(j) for some j < k. a(n) is the number of distinct possible values taken on by x(n).at n=15A075529
- Maximum number of regions into which the plane can be divided using n (concave) quadrilaterals.at n=27A077591
- Numbers k such that the k-th difference between 2 successive primes equals the squarefree part of k.at n=17A078691
- a(n) = 2*prime(n)^2.at n=15A079704
- a(n) = number of m such that A080737(m) <= 2n.at n=33A080740
- a(n) = 3^n-1+C(2n,n).at n=7A081670
- Left truncatable 3-almost primes, in which repeatedly deleting the leftmost digit gives a 3-almost prime at every step until a single-digit 3-almost prime remains.at n=37A085248