3971
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 4572
- Proper Divisor Sum (Aliquot Sum)
- 601
- 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
- 3420
- Möbius Function
- 0
- Radical
- 209
- Omega Function (Ω)
- 3
- 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
- 51
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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
Appears in sequences
- Coordination sequence T1 for Zeolite Code AFS.at n=48A008023
- Coordination sequence T1 for Zeolite Code BPH.at n=48A008055
- Coordination sequence T1 for Zeolite Code RTE.at n=43A009890
- Coordination sequence for Ni2In, Position Ni1 and In.at n=19A009941
- a(0) = 1, a(n) = 9*n^2 + 2 for n>0.at n=21A010002
- Expansion of x/(1 - 7*x - 10*x^2).at n=5A015568
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 63.at n=0A031561
- Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 63.at n=0A031741
- a(n) = 11*n^2.at n=19A033584
- Divisors = 3 (mod 4) of Descartes's 198585576189.at n=38A033871
- Composite numbers whose prime factors contain no digits other than 1 and 9.at n=9A036309
- Number of partitions satisfying (cn(1,5) = cn(4,5) and cn(0,5) <= cn(2,5) and cn(0,5) <= cn(3,5) and cn(1,5) <= cn(2,5) and cn(1,5) <= cn(3,5)).at n=45A036817
- Coordination sequence T1 for Zeolite Code STF.at n=42A038443
- Numbers ending with '1' that are the difference of two positive cubes.at n=19A038856
- Numbers n such that 103*2^n-1 is prime.at n=15A050577
- Numerators of row 4 of table described in A051714/A051715.at n=37A051722
- Step cyclic shifted sequence structures using a maximum of five different symbols.at n=10A056432
- Numbers that in base 2 need twelve 'Reverse and Add' steps to reach a palindrome.at n=26A066133
- Numbers n such that n*phi(n-1) is a perfect square.at n=13A069069
- Prefixing, suffixing or inserting a 9 in the number anywhere gives a prime.at n=23A069833