5149
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 5440
- Proper Divisor Sum (Aliquot Sum)
- 291
- 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
- 4860
- Möbius Function
- 1
- Radical
- 5149
- 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
- yes
- Narcissistic Number
- no
- Collatz Steps
- 147
- 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
- Pseudoprimes to base 13.at n=19A020141
- Pseudoprimes to base 23.at n=39A020151
- Pseudoprimes to base 28.at n=25A020156
- Pseudoprimes to base 29.at n=31A020157
- Pseudoprimes to base 93.at n=37A020221
- Strong pseudoprimes to base 13.at n=2A020239
- Strong pseudoprimes to base 28.at n=8A020254
- Strong pseudoprimes to base 29.at n=8A020255
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 70 ones.at n=1A031838
- Sort-then-add sequence: a(1) = 316, a(n+1) = a(n) + sort(a(n)).at n=6A033861
- Multiplicity of highest weight (or singular) vectors associated with character chi_95 of Monster module.at n=37A034483
- Can express a(n) with the digits of a(n)^2 in order, only adding plus signs.at n=43A038206
- a(n)=(s(n)+2)/9, where s(n)=n-th base 9 palindrome that starts with 7.at n=25A043078
- a(n) = 4*n^2 - 9*n + 6.at n=36A054556
- Dimension of the space of weight n cuspidal newforms for Gamma_1( 88 ).at n=39A063361
- Numbers k such that Euler phi(k) / Carmichael lambda(k) = 18.at n=26A066697
- Number of 5 X n binary arrays with a path of adjacent 1's and no path of adjacent 0's from top row to bottom row.at n=2A069419
- Number of n X 3 binary arrays with a path of adjacent 1's and no path of adjacent 0's from top row to bottom row.at n=4A069423
- Vertical of triangular spiral in A051682.at n=33A081271
- Counterexamples to the conjecture that an even, prime-indexed triangular plus 1 equals a prime or that an odd, prime-indexed triangular minus 2 equals a prime.at n=5A097785