9315
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 20
- Divisor Sum
- 17424
- Proper Divisor Sum (Aliquot Sum)
- 8109
- 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
- 4752
- Möbius Function
- 0
- Radical
- 345
- Omega Function (Ω)
- 6
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 153
- 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
- 9 times the triangular numbers A000217.at n=45A027468
- a(n) = 3*a(n-1) + 3*a(n-2), a(0)=0, a(1)=1.at n=8A030195
- Lucky numbers with size of gaps equal to 16 (lower terms).at n=27A031898
- a(n) = (2*n+1) * (4*n-1).at n=34A033566
- Number of inequivalent binary [ n,3 ] codes of dimension <= 3 without zero columns.at n=27A034337
- Odd numbers divisible by exactly 6 primes (counted with multiplicity).at n=28A046319
- Number of nonprimes <= prime(n)^2.at n=26A053683
- Numbers k such that sigma(2k + 2) = 4k.at n=7A067680
- Numbers k such that tau_3(k) (the number of ordered factorizations of k as k = r*s*t) divides k.at n=41A069147
- Number of polyiamonds with n cells that tile the plane isohedrally but not by translation or by 180-degree rotation (Conway criterion).at n=15A075222
- Duplicate of A030195.at n=7A085481
- (n / product of digits of n) is a semiprime.at n=22A085773
- Smallest k such that k and k+n have the same prime signature that is different from all previous terms.at n=12A085876
- Duplicate of A085876.at n=12A086490
- Expansion of 1 + Sum_{i>=1} (x^prime(i)/Product_{j=1..i} (1-x^j)).at n=47A095700
- Integers that are Rhonda numbers to base 12.at n=8A100971
- Number of totally ramified extensions over Q_5 with degree n in the algebraic closure of Q_5.at n=14A100981
- Lynch-Bell numbers n such that 5 is a digit of n.at n=11A116957
- Lynch-Bell numbers whose digits are all odd.at n=15A117913
- Numbers k such that A003422(k+1)/2 is prime.at n=17A124375