2201
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 5
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 2304
- Proper Divisor Sum (Aliquot Sum)
- 103
- 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
- 2100
- Möbius Function
- 1
- Radical
- 2201
- 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
- 138
- Smith Number
- no
- Vampire 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
Appears in sequences
- Primes in ternary.at n=20A001363
- Numbers whose cube is a palindrome.at n=8A002780
- Divisors of 2^35 - 1.at n=4A003542
- Coordination sequence T2 for Zeolite Code EUO.at n=29A008097
- Representation of n in base of Catalan numbers (a classic greedy version).at n=39A014418
- Numbers n such that phi(n + 9) | sigma(n) for n not congruent to 0 (mod 3).at n=38A015849
- Pseudoprimes to base 46.at n=32A020174
- Pseudoprimes to base 54.at n=12A020182
- Pseudoprimes to base 66.at n=12A020194
- Pseudoprimes to base 70.at n=17A020198
- Pseudoprimes to base 85.at n=26A020213
- Strong pseudoprimes to base 46.at n=11A020272
- Strong pseudoprimes to base 85.at n=4A020311
- Numbers k such that the continued fraction for sqrt(k) has period 38.at n=18A020377
- n written in fractional base 4/2.at n=25A024630
- a(n) = (n + 3)^2 - 8.at n=44A028884
- Numbers whose base-2 and base-10 expansions have the same digit sum.at n=43A037308
- Positive numbers having the same set of digits in base 3 and base 10.at n=29A037422
- Positive numbers having the same set of digits in base 4 and base 10.at n=16A037428
- Numerators of continued fraction convergents to sqrt(585).at n=5A042120