654
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 15
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 1320
- Proper Divisor Sum (Aliquot Sum)
- 666
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- yes
Derived Values
- Euler's Totient
- 216
- Möbius Function
- -1
- Radical
- 654
- 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
- no
- Narcissistic Number
- no
- Collatz Steps
- 144
- Smith Number
- yes
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
- yes
- Odd
- no
Names
- German
- sechshundertvierundfünfzig· ordinal: sechshundertvierundfünfzigste
- English
- six hundred fifty-four· ordinal: six hundred fifty-fourth
- Spanish
- seiscientos cincuenta y cuatro· ordinal: 654º
- French
- six cent cinquante-quatre· ordinal: six cent cinquante-quatrième
- Italian
- seicentocinquantaquattro· ordinal: 654º
- Latin
- sescenti quinquaginta quattuor· ordinal: 654.
- Portuguese
- seiscentos e cinquenta e quatro· ordinal: 654º
Appears in sequences
- Number of partitions into non-integral powers.at n=4A000397
- Number of dissections of a convex (n+2)-gon into triangles and quadrilaterals by nonintersecting diagonals.at n=6A001002
- Numbers k such that 3^k, 3^(k+1) and 3^(k+2) have the same number of digits.at n=30A001682
- Numbers k such that 17*2^k - 1 is prime.at n=15A001774
- Expansion of (1-x)/(1 - 3*x + x^2)^2.at n=5A001870
- Narayana-Zidek-Capell numbers: a(n) = 1 for n <= 2. Otherwise a(2n) = 2a(2n-1), a(2n+1) = 2a(2n) - a(n).at n=12A002083
- Numbers k such that 15*2^k + 1 is prime.at n=19A002258
- Number of integral points in a certain sequence of open quadrilaterals.at n=40A002578
- Numbers whose ternary expansion contains no 1's.at n=50A005823
- Numerators of worst case for Engel expansion.at n=23A006539
- Smith (or joke) numbers: composite numbers k such that sum of digits of k = sum of digits of prime factors of k (counted with multiplicity).at n=31A006753
- Oscillates under partition transform.at n=27A007210
- A grasshopper sequence: closed under n -> 2n+2 and 6n+6.at n=41A007319
- Shifts 2 places left under binomial transform.at n=9A007476
- Unique period lengths of primes mentioned in A007615.at n=28A007498
- Impractical numbers: even abundant numbers (A173490) that are not practical(2) (A007620).at n=34A007621
- Number of factors in the infinite word formed by the Kolakoski sequence A000002.at n=30A007782
- Coordination sequence T2 for Zeolite Code AST.at n=18A008037
- Coordination sequence T4 for Zeolite Code EUO.at n=16A008099
- Coordination sequence T1 for Zeolite Code LOV.at n=17A008134