5941
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
- 6412
- Proper Divisor Sum (Aliquot Sum)
- 471
- 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
- 5472
- Möbius Function
- 1
- Radical
- 5941
- 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
- 49
- 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
- Hex (or centered hexagonal) numbers: 3*n*(n+1)+1 (crystal ball sequence for hexagonal lattice).at n=44A003215
- Number of intersections of diagonals in the interior of a regular n-gon.at n=21A006561
- Pseudoprimes to base 18.at n=33A020146
- Strong pseudoprimes to base 18.at n=11A020244
- Numbers k such that the continued fraction for sqrt(k) has period 55.at n=5A020394
- Least m such that if r and s in {1/4, 1/8, 1/12, ..., 1/4n} satisfy r < s, then r < k/m < (k+1)/m < s for some integer k.at n=29A024839
- Numbers ending with '1' that are the difference of two positive cubes.at n=26A038856
- Numerators of continued fraction convergents to sqrt(865).at n=7A042670
- Number of factorizations with 3 levels of parentheses indexed by prime signatures. A050340(A025487).at n=20A050341
- Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 15.at n=10A051980
- Number of positive integers <= 2^n of form x^2 + 7 y^2.at n=15A054151
- Numbers n such that n and its reversal are both multiples of 13.at n=29A062903
- Non-palindromic number and its reversal are both multiples of 13.at n=17A062912
- Numbers having exactly ten anti-divisors.at n=40A066476
- a(n) = (prime(n)^2 + 1)/2.at n=27A066885
- Downward vertical of triangular spiral in A051682.at n=18A081272
- Number of deterministic completely defined acyclic automata with 2 inputs and n transient labeled states (and a unique absorbing state).at n=4A082157
- Deterministic completely defined quasi-acyclic automata with 2 inputs, n transient and k absorbing labeled states.at n=14A082169
- Expansion of (1+4x+7x^2)/((1-x)^2*(1-x^2)).at n=44A090381
- (Prime(prime(n))^2+1)/2.at n=9A092773