611
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 8
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 672
- Proper Divisor Sum (Aliquot Sum)
- 61
- 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
- 552
- Möbius Function
- 1
- Radical
- 611
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 38
- Smith 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
- no
- Odd
- yes
Names
- German
- sechshundertelf· ordinal: sechshundertelfste
- English
- six hundred eleven· ordinal: six hundred eleventh
- Spanish
- seiscientos once· ordinal: 611º
- French
- six cent onze· ordinal: six cent onzième
- Italian
- seicentoundici· ordinal: 611º
- Latin
- sescenti undecim· ordinal: 611.
- Portuguese
- seiscentos e onze· ordinal: 611º
Appears in sequences
- Essentially the same as A001611.at n=13A000381
- Numbers beginning with letter 's' in English.at n=35A000870
- a(n) = Fibonacci(n) + 1.at n=15A001611
- From a Goldbach conjecture: the location of records in A185091.at n=8A002091
- Numbers k such that (k^2 + k + 1)/7 is prime.at n=52A002641
- Coefficients in expansion of permanent of infinite tridiagonal matrix shown below.at n=40A003113
- Numbers that are the sum of 6 positive 4th powers.at n=45A003340
- Inverse Möbius transform of A003965.at n=40A003981
- Even numbers written backwards.at n=58A004093
- a(n) = round(n*phi^8), where phi is the golden ratio, A001622.at n=13A004943
- a(n) = ceiling(n*phi^6), where phi is the golden ratio.at n=34A004961
- a(n) = ceiling(n*phi^8), where phi is the golden ratio, A001622.at n=13A004963
- Largest number not a sum of distinct primes >= prime(n).at n=43A007414
- Fibonacci(n) - (-1)^n.at n=14A007492
- Primitive modest numbers.at n=27A007627
- Generated by a sieve: keep first number, drop every 2nd, keep first, drop every 3rd, keep first, drop every 4th, etc.at n=42A007952
- Coordination sequence T2 for Zeolite Code CAS.at n=15A008064
- Coordination sequence T4 for Zeolite Code FER.at n=15A008109
- Coordination sequence T4 for Zeolite Code MTW.at n=16A008199
- Coordination sequence T1 for Zeolite Code VFI.at n=19A008245