5553
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 8034
- Proper Divisor Sum (Aliquot Sum)
- 2481
- 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
- 3696
- Möbius Function
- 0
- Radical
- 1851
- 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
- 129
- 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
- Numbers k such that the continued fraction for sqrt(k) has period 68.at n=11A020407
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 34 ones.at n=35A031802
- Number of partitions of n such that cn(0,5) = cn(2,5) < cn(1,5) <= cn(3,5) = cn(4,5).at n=70A036856
- Base 7 digits are, in order, the first n terms of the periodic sequence with initial period 2,2,1.at n=4A037564
- Base-7 palindromes that start with 2.at n=31A043016
- Numbers whose base-7 representation contains exactly four 2's.at n=5A043404
- Numbers having three 5's in base 10.at n=18A043511
- a(n) = (a(n-1)a(n-5) + a(n-2)a(n-4) + a(n-3)^2)/a(n-6).at n=54A058232
- a(1) = 1, a(n) = a(n - 1) + pi(a(n - 1)) + 1.at n=35A065962
- Self-reciprocating sequence: the integer part of powers of the reciprocal sum.at n=14A066173
- a(1) = 1; a(n) = Sum (n+k)!a(k)/(2k)!, k = 1..n-1.at n=4A067000
- a(n) = Sum_{d|n} (n/d)^(d-1).at n=23A087909
- Beginning with 1, numbers such that the differences a(k)-a(k-1) are distinct and every concatenation n>1 is prime.at n=36A090504
- Number of compositions of n where the smallest part is greater than the number of parts.at n=42A098132
- Expansion of x*(x^4 - x^3 + 4x^2 - 3x + 1)/(1 - 5x + 9x^2 - 8x^3 + 2x^4 - x^5).at n=10A111110
- Indices of prime Padovan numbers: values of k such that A000931(k+5) is prime.at n=19A112882
- a(n)*n = A112893(n).at n=3A112894
- Last entry (and high point) in segment n of A079051.at n=29A117516
- Numbers k such that the numerator of Sum_{j=1..k} k^2/(2*j*(j+k)) is prime.at n=37A125745
- a(n) = A131766(n) / 18.at n=22A131871