2055
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 12
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 3312
- Proper Divisor Sum (Aliquot Sum)
- 1257
- 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
- 1088
- Möbius Function
- -1
- Radical
- 2055
- Omega Function (Ω)
- 3
- Little Omega Function (ω)
- 3
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
- 37
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- Number of primitive n-bead necklaces (turning over is allowed) where complements are equivalent.at n=17A000046
- Sum of 11 positive 9th powers.at n=4A004800
- Numbers that are the sum of 9 positive 10th powers.at n=2A004809
- Numbers that are the sum of 8 positive 11th powers.at n=1A004819
- Numbers that are the sum of at most 9 nonzero 10th powers.at n=26A004904
- Numbers that are the sum of at most 10 nonzero 10th powers.at n=28A004905
- Numbers that are the sum of at most 11 nonzero 10th powers.at n=30A004906
- Numbers that are the sum of at most 12 nonzero 10th powers.at n=32A004907
- Numbers that are the sum of at most 8 positive 11th powers.at n=16A004914
- Numbers that are the sum of at most 9 positive 11th powers.at n=17A004915
- Numbers that are the sum of at most 10 positive 11th powers.at n=18A004916
- Numbers that are the sum of at most 11 positive 11th powers.at n=19A004917
- Numbers that are the sum of at most 12 positive 11th powers.at n=20A004918
- Array (a frieze pattern) defined by a(n,k) = (a(n-1,k)*a(n-1,k+1) - 1) / a(n-2,k+1), read by antidiagonals.at n=33A007754
- Partial sums of (Catalan numbers starting 1, 2, 5, ...).at n=8A014138
- Rectilinear crossing number of complete graph on n nodes.at n=20A014540
- Expansion of g.f. 1/((1-4*x)*(1-11*x)).at n=3A016158
- a(n) = least m such that if r and s in {1/1, 1/4, 1/7,..., 1/(3n-2)} satisfy r < s, then r < k/m < s for some integer k.at n=30A024822
- Convolution of Thue-Morse sequence A001285 with primes.at n=27A029888
- Numbers having period-4 6-digitized sequences.at n=6A031197