5547
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 21
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 7572
- Proper Divisor Sum (Aliquot Sum)
- 2025
- 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
- 3612
- Möbius Function
- 0
- Radical
- 129
- Omega Function (Ω)
- 3
- 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
- 54
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 23.at n=30A031521
- Lucky numbers with size of gaps equal to 20 (upper terms).at n=11A031903
- a(n) = 3*n^2.at n=43A033428
- Composite numbers whose prime factors contain no digits other than 3 and 4.at n=15A036314
- Minimum area rectangle into which squares of sizes 1, 2, 3, ... n can be packed.at n=24A038666
- Has both a primitive and imprimitive representation as x^2 + xy + y^2.at n=41A045897
- Numbers that are the product of 3 prime factors whose concatenation is a palindrome.at n=19A046452
- Numbers k such that 2^k + 3 is prime.at n=29A057732
- Number of numbers whose cube root rounds to n.at n=43A058034
- Number of primes below n^3 does not exceed n times the number of primes below n^2.at n=46A060304
- Numbers k such that k and k+1 have the same sum of unitary divisors (A034448).at n=17A064125
- Least k such that k*10^n +/- 1 are twin primes.at n=42A064218
- Squarefree part of n equals bigomega(n).at n=41A069550
- a(n) = Sum_{i=n+1..2n} prime(i) - Sum_{i=1..n} prime(i).at n=32A077354
- 3p^2 where p runs through the primes.at n=13A079705
- Cumulative minima of A006046(n)/n^theta, where theta=log(3)/log(2), is a local minimum.at n=13A084230
- a(n) = - a(n-1) + 5(a(n-2) + a(n-3)) - 2(a(n-4) + a(n-5)) - 8(a(n-6) + a(n-7)).at n=15A090597
- Numbers with ordered prime signature (1,2).at n=43A095990
- A bisection of A000960.at n=41A099062
- Composite numbers whose exponents in their canonical factorization are an initial segment of the positive integers.at n=44A102835