5445
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- yes
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 18
- Divisor Sum
- 10374
- Proper Divisor Sum (Aliquot Sum)
- 4929
- 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
- 2640
- Möbius Function
- 0
- Radical
- 165
- Omega Function (Ω)
- 5
- 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
- yes
- 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
- Number of nonseparable tree-rooted planar maps with n + 2 edges and 3 vertices.at n=8A006411
- Coordination sequence T7 for Zeolite Code DDR.at n=46A008077
- Let j = | i - i_written_backwards |, k = j + j_written_backwards; then k is in this sequence.at n=31A008920
- a(n) = dot_product(1,2,...,n)*(6,7,...,n,1,2,3,4,5).at n=21A026046
- a(n) = Sum_{k = 1..n} T(k,k-1), where T is the array defined in A024996.at n=9A026079
- a(n) = 5*n^2.at n=33A033429
- Multiplicity of highest weight (or singular) vectors associated with character chi_62 of Monster module.at n=35A034450
- Cycle of 2 steps possible for 'concatenate a(n) and nextprime(a(n)) is a prime'.at n=36A034592
- Number of partitions of n into parts not of the form 23k, 23k+4 or 23k-4. Also number of partitions with at most 3 parts of size 1 and differences between parts at distance 10 are greater than 1.at n=32A035992
- Numbers that are palindromic and divisible by 5.at n=17A043040
- Numbers k that divide 10^k + 5^k.at n=49A045599
- Palindromic and divisible by 9.at n=17A045644
- Palindromes with exactly 5 prime factors (counted with multiplicity).at n=14A046331
- Odd composite numbers divisible by the sum of their prime factors (counted with multiplicity).at n=18A046347
- Composite palindromes divisible by the sum of their prime factors (counted with multiplicity).at n=3A046348
- Palindromic composite numbers with only palindromic prime factors.at n=50A046351
- Composite palindromes whose sum of prime factors is palindromic (counted with multiplicity).at n=14A046354
- Odd numbers with only palindromic prime factors whose sum is palindromic (counted with multiplicity).at n=20A046356
- Composite palindromes with only palindromic prime factors whose sum is palindromic (counted with multiplicity).at n=6A046357
- Composite numbers divisible by the palindromic sum of their prime factors (counted with multiplicity).at n=14A046358