671
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 744
- Proper Divisor Sum (Aliquot Sum)
- 73
- 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
- 600
- Möbius Function
- 1
- Radical
- 671
- 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
- 95
- 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
- sechshunderteinundsiebzig· ordinal: sechshunderteinundsiebzigste
- English
- six hundred seventy-one· ordinal: six hundred seventy-first
- Spanish
- seiscientos setenta y uno· ordinal: 671º
- French
- six cent soixante-onze· ordinal: six cent soixante-onzième
- Italian
- seicentosettantuno· ordinal: 671º
- Latin
- sescenti septuaginta unus· ordinal: 671.
- Portuguese
- seiscentos e setenta e um· ordinal: 671º
Appears in sequences
- Coefficients of the 3rd-order mock theta function f(q).at n=51A000025
- Coefficient of q^(2n-1) in the series expansion of Ramanujan's mock theta function f(q).at n=25A000199
- Squares written in base 8.at n=20A002441
- Numerator of the n-th harmonic number H(n) divided by (n+1); a(n) = A001008(n) / ((n+1)*A002805(n)).at n=9A002547
- Numerators of central difference coefficients M_{3}^(2n+1).at n=4A002673
- Number of 3-connected nets with n edges.at n=11A002880
- Reverse digits of number of partitions of n.at n=15A004089
- Pentagonal numbers written backwards.at n=11A004163
- Divisible only by primes congruent to 1 mod 5.at n=33A004615
- Convolution of A002024 with itself.at n=28A004797
- a(n) = 6^n - 5^n.at n=4A005062
- Self-contained numbers: odd numbers k whose Collatz sequence contains a higher multiple of k.at n=4A005184
- a(n) = A259095(2n,n).at n=13A005575
- Maxima of the rows of the triangle A259095.at n=27A005577
- Rhombic dodecahedral numbers: a(n) = n^4 - (n - 1)^4.at n=5A005917
- Pseudoprimes to base 3.at n=3A005935
- a(n) = n*(n^2 + 1)/2.at n=11A006003
- Number of distributive lattices; also number of paths with n turns when light is reflected from 5 glass plates.at n=5A006358
- A series for Pi.at n=3A006934
- Tower of Hanoi with 5 pegs.at n=44A007665