6145
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 7380
- Proper Divisor Sum (Aliquot Sum)
- 1235
- 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
- 4912
- Möbius Function
- 1
- Radical
- 6145
- 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
- Number of nonnegative solutions to x^2 + y^2 + z^2 <= n^2.at n=22A000604
- a(0) = 1; thereafter a(n) = 3*2^(n-1) + 1.at n=12A004119
- Numbers that are the sum of 7 positive 10th powers.at n=6A004807
- Numbers that are the sum of 4 positive 11th powers.at n=3A004815
- Numbers that are the sum of at most 7 nonzero 10th powers.at n=34A004902
- Numbers that are the sum of at most 4 positive 11th powers.at n=13A004910
- Numbers that are the sum of at most 5 positive 11th powers.at n=16A004911
- Numbers that are the sum of at most 6 positive 11th powers.at n=19A004912
- Numbers that are the sum of at most 7 positive 11th powers.at n=22A004913
- Numbers that are the sum of at most 8 positive 11th powers.at n=25A004914
- Numbers that are the sum of at most 9 positive 11th powers.at n=28A004915
- Numbers that are the sum of at most 10 positive 11th powers.at n=31A004916
- Numbers that are the sum of at most 11 positive 11th powers.at n=34A004917
- Numbers that are the sum of at most 12 positive 11th powers.at n=37A004918
- Numbers k such that the continued fraction for sqrt(k) has period 29.at n=12A020368
- Least m such that if r and s in {1/3, 1/6, 1/9, ..., 1/3n} satisfy r < s, then r < k/m < (k+1)/m < s for some integer k.at n=34A024838
- Sequence satisfies T^2(a)=a, where T is defined below.at n=51A027594
- Numbers whose base-5 representation contains exactly two 0's and three 4's.at n=14A045213
- a(n) = T(5,n), array T given by A048472.at n=8A048477
- a(n) = a(n-1) + a(m) for n >= 4, where m = 2*n - 3 - 2^(p+1) and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = a(2) = 1 and a(3) = 2.at n=36A050028