555
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 15
- Digital Root
- 6
- Palindromic Number
- yes
- Repdigit
- yes
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 912
- Proper Divisor Sum (Aliquot Sum)
- 357
- 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
- 288
- Möbius Function
- -1
- Radical
- 555
- 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
- yes
- Narcissistic Number
- no
- Collatz Steps
- 30
- Smith 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
Names
- German
- fünfhundertfünfundfünfzig· ordinal: fünfhundertfünfundfünfzigste
- English
- five hundred fifty-five· ordinal: five hundred fifty-fifth
- Spanish
- quinientos cincuenta y cinco· ordinal: 555º
- French
- cinq cent cinquante-cinq· ordinal: cinq cent cinquante-cinqième
- Italian
- cinquecentocinquantacinque· ordinal: 555º
- Latin
- quingenti quinquaginta quinque· ordinal: 555.
- Portuguese
- quinhentos e cinquenta e cinco· ordinal: 555º
Appears in sequences
- Number of paraffins C_n H_{2n} X Y with n carbon atoms.at n=8A000635
- Boustrophedon transform of partition numbers.at n=6A000751
- a(n) = a(n-1) + a(n-2) with a(0)=2, a(1)=5. Sometimes called the Evangelist Sequence.at n=11A001060
- Moran numbers: k such that k/(sum of digits of k) is prime.at n=41A001101
- Number of inequivalent Costas arrays of order n under dihedral group.at n=10A001441
- A Fielder sequence: a(n) = a(n-1) + a(n-2) - a(n-7), n >= 8.at n=13A001636
- a(n) = a(n-2) + a(n-5).at n=36A001687
- Related to Zarankiewicz's problem.at n=31A001841
- a(n) = 5*(10^n - 1)/9.at n=3A002279
- a(n) = a(n-1) + a(n-2) - a(n-3).at n=21A002798
- Numbers that are the sum of 9 positive 5th powers.at n=21A003354
- Divisors of 2^36 - 1.at n=46A003543
- Discriminants of the known imaginary quadratic fields with 1 class per genus (a finite sequence).at n=43A003644
- "Magic" integers: a(n+1) is the smallest integer m such that there is no overlap between the sets {m, m-a(i), m+a(i): 1 <= i <= n} and {a(i), a(i)-a(j), a(i)+a(j): 1 <= j < i <= n}.at n=16A004210
- a(n) = n*(5*n - 1)/2.at n=15A005476
- Positions of remoteness 5 in Beans-Don't-Talk.at n=28A005697
- Number of inequivalent strong starters in cyclic group of order 2n+1.at n=9A006205
- Numbers k such that phi(k) = phi(sigma(k)).at n=25A006872
- Largest number not a sum of distinct primes >= prime(n).at n=39A007414
- Coordination sequence T1 for Zeolite Code ATV.at n=15A008043