5554
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 8334
- Proper Divisor Sum (Aliquot Sum)
- 2780
- 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
- 2776
- Möbius Function
- 1
- Radical
- 5554
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 129
- 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
- yes
- Odd
- no
Appears in sequences
- Numbers that are the sum of 3 nonzero 6th powers.at n=15A003359
- Numbers that are the sum of at most 3 nonzero 6th powers.at n=29A004854
- Kaprekar triples: q such that q = x + y + z and q^3 = x*10^2n + y*10^n + z, where z < 10^n and n is the number of digits in q. q is not a power of 10 (except q=1).at n=11A006887
- Expansion of 1/(1-x^5-x^6-x^7-x^8-x^9-x^10).at n=42A017841
- Numbers k such that the continued fraction for sqrt(k) has period 29.at n=11A020368
- Numbers in which all pairs of consecutive base-6 digits differ by 3.at n=23A033077
- Number of partitions satisfying cn(0,5) + cn(2,5) <= cn(1,5) + cn(4,5) and cn(0,5) + cn(3,5) <= cn(1,5) + cn(4,5).at n=31A039887
- Base-6 palindromes that start with 4.at n=24A043013
- Numbers having three 5's in base 10.at n=19A043511
- Numbers k such that k^12 == 1 (mod 13^3).at n=30A056086
- a(n) is smallest positive integer, distinct from any terms earlier in the sequence, such that (sum{k=1 to n}[a(k)]) divides (product{k=1 to n}[a(k)])*(sum{k=1 to n}[1/a(k)]).at n=13A058330
- Pseudo-Kaprekar triples: q such that if q=x+y+z, then q^3=x*10^i + y*10^j + z, where (y*10^j+z < 10^i) and z < 10^j.at n=21A060768
- Erroneous version of A006887.at n=12A060809
- a(0) = 0; a(n) is obtained by incrementing each digit of a(n-1) by 2.at n=12A061513
- Numbers with no zeros in their cubes such that the products of the digits of their cubes are also cubes.at n=39A067071
- Four-digit numbers that do not resolve to 6174 under the Kaprekar map (see A151949).at n=39A069746
- Values of n corresponding to the terms in sequence A080155. For any k, the concatenation of the a(1) to a(k)-th primes is prime and each value of k is the smallest for which this is true.at n=45A080156
- a(n) = sqrt(A084004(n)).at n=9A084005
- Let M = 2 X 2 matrix [ 1 2 / 5 4 ]; a(n) = (2,2) entry of M^n.at n=4A092167
- Near-repdigit semiprimes with 5 as repeated digit.at n=21A105986