2049
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 15
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 2736
- Proper Divisor Sum (Aliquot Sum)
- 687
- 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
- 1364
- Möbius Function
- 1
- Radical
- 2049
- 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
- 156
- 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
- a(n) = 2^n + 1.at n=11A000051
- Cullen numbers: a(n) = n*2^n + 1.at n=8A002064
- Take solution to Pellian equation x^2 - n*y^2 = 1 with smallest positive y and x >= 0; sequence gives a(n) = x, or 1 if n is a square. A002349 gives values of y.at n=40A002350
- Numbers that are the sum of 3 positive 5th powers.at n=16A003348
- Numbers that are the sum of 9 nonzero 8th powers.at n=8A003387
- Numbers that are the sum of 5 positive 9th powers.at n=4A003394
- Divisors of 2^22 - 1.at n=8A003531
- Divisors of 2^44 - 1.at n=17A003549
- Numbers that are the sum of 3 nonzero 10th powers.at n=2A004803
- Numbers that are the sum of 2 positive 11th powers.at n=1A004813
- Numbers that are the sum of at most 3 positive 5th powers.at n=31A004843
- Numbers that are the sum of at most 5 positive 9th powers.at n=19A004889
- Numbers that are the sum of at most 6 positive 9th powers.at n=23A004890
- Numbers that are the sum of at most 7 positive 9th powers.at n=27A004891
- Numbers that are the sum of at most 8 positive 9th powers.at n=31A004892
- Numbers that are the sum of at most 9 positive 9th powers.at n=35A004893
- Numbers that are the sum of at most 10 positive 9th powers.at n=39A004894
- Numbers that are the sum of at most 3 nonzero 10th powers.at n=8A004898
- Numbers that are the sum of at most 4 nonzero 10th powers.at n=10A004899
- Numbers that are the sum of at most 5 nonzero 10th powers.at n=12A004900