6625
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
- 8
- Divisor Sum
- 8424
- Proper Divisor Sum (Aliquot Sum)
- 1799
- 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
- 5200
- Möbius Function
- 0
- Radical
- 265
- Omega Function (Ω)
- 4
- 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
- 75
- 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 points of norm <= n^2 in square lattice.at n=46A000328
- Numbers k such that k^2 and k have same last 3 digits.at n=27A008853
- Numbers k such that the continued fraction for sqrt(k) has period 39.at n=6A020378
- Every suffix prime and no 0 digits in base 7 (written in base 7).at n=17A024782
- Numbers that are the sum of 2 nonzero squares in exactly 4 ways.at n=35A025287
- Numbers that are the sum of 2 nonzero squares in 4 or more ways.at n=36A025295
- Numbers that are the sum of 2 distinct nonzero squares in exactly 4 ways.at n=35A025305
- Numbers that are the sum of 2 distinct nonzero squares in 4 or more ways.at n=36A025314
- Numbers in which all pairs of consecutive base-8 digits differ by 3.at n=47A033079
- Composite numbers whose prime factors contain no digits other than 3 and 5.at n=41A036315
- Number of partitions satisfying cn(2,5) <= cn(0,5) + cn(1,5) + cn(4,5) and cn(3,5) <= cn(0,5) + cn(1,5) + cn(4,5).at n=31A039871
- 24-gonal numbers: a(n) = n*(11*n-10).at n=25A051876
- Numbers n such that n | 5^n + 4^n + 1.at n=21A057302
- Number of singular points on n-th order Chmutov surface.at n=25A057870
- Numbers n such that the digits of P_7(n), the n-th heptagonal number, end in n.at n=28A067271
- Convolution of Fibonacci F(n+1), n>=0, with F(n+8), n>=0.at n=8A067431
- Centered 24-gonal numbers.at n=23A069190
- Smallest integer > 1 which is both n-gonal and centered n-gonal.at n=21A072277
- Total number of prime power parts in all partitions of n.at n=23A073335
- Octo numbers (a polygonal sequence): a(n) = 5*n^2 - 6*n + 2 = (n-1)^2 + (2*n-1)^2.at n=36A079273