9475
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 25
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 11780
- Proper Divisor Sum (Aliquot Sum)
- 2305
- 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
- 7560
- Möbius Function
- 0
- Radical
- 1895
- 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
- yes
- Narcissistic Number
- no
- Collatz Steps
- 60
- 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
- Pseudoprimes to base 51.at n=32A020179
- Strong pseudoprimes to base 51.at n=9A020277
- Composite numbers k such that the sum of the proper divisors of k not including 1, (Chowla's function, A048050) and their product (A007956) are both perfect squares.at n=27A064180
- Numbers n such that ((n-1)^2+1)/2 and n^2+1 and ((n+1)^2+1)/2 are prime if n is even or (n-1)^2+1 and (n^2+1)/2 and (n+1)^2+1 are prime if n is odd.at n=43A082612
- Start with 1 and repeatedly reverse the digits and add 48 to get the next term.at n=29A118160
- Start with 1027 and repeatedly reverse the digits and add 16 to get the next term.at n=6A119455
- Conjecturally, number of generators of degree n of the Hopf algebra of parking functions, regarded as a dendriform trialgebra.at n=5A141316
- Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 1), (1, -1, 0), (1, 1, -1), (1, 1, 0)}.at n=8A149212
- Numbers n such that 2^x + 3^y is never prime when max(x,y) = n.at n=14A159625
- Numbers of the form 12n+7 for which Sum_{i=0..(4n+2)} J(i,12n+7) = 0, where J(i,m) is the Jacobi symbol.at n=27A165463
- Erroneous version of A141316.at n=5A185272
- Number of (n+1) X (n+1) -4..4 symmetric matrices with every 2 X 2 subblock having sum zero and one or three distinct values.at n=8A211492
- Values of x such that x^2 + y^2 = 61^n with x and y coprime and 0 < x < y.at n=4A230841
- a(n) = Fibonacci(p) mod p^2, where p = prime(n).at n=26A236395
- Number of partitions of n into two sorts of parts having exactly 5 parts of the second sort.at n=9A258475
- Number of length-n ternary sequences where the sum of each block differs by at most 1 from every other block of the same length.at n=35A274008
- Numbers m such that m^2+1 is semiprime with (m-1)^2+1 and (m+1)^2+1 primes.at n=23A321985
- Number of non-nesting connected simple graphs with vertices {1..n}.at n=7A326350
- Numbers that are the sum of ten fourth powers in exactly nine ways.at n=32A345861
- Expansion of x*(1+x-7*x^3-3*x^4+x^5)/(1-2*x^2-9*x^3+3*x^5).at n=12A356695