9122
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 13686
- Proper Divisor Sum (Aliquot Sum)
- 4564
- 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
- 4560
- Möbius Function
- 1
- Radical
- 9122
- 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
- 60
- 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
- yes
- Odd
- no
Appears in sequences
- Sum of 12 nonzero 8th powers.at n=23A003390
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 94.at n=21A031592
- Positive numbers having the same set of digits in base 7 and base 9.at n=41A037439
- (s(n)+1)/10, where s(n)=n-th base 10 palindrome that starts with 9.at n=34A043088
- Numbers whose base-5 representation contains exactly three 2's and three 4's.at n=6A045292
- Closed 3-dimensional ball numbers (version 2): a(n)= number of integer points (i,j,k) contained in a closed ball of diameter n, centered at (1/2,0,0).at n=26A053593
- Open 3-dimensional ball numbers (version 2): a(n) is the number of integer points (i,j,k) contained in an open ball of diameter n, centered at (1/2,0,0).at n=26A053594
- T(2n+3,n), where T is the array in A055830.at n=5A055837
- Self-convolution of A073739; odd-indexed terms are twice the odd primes.at n=54A073740
- Row sums in triangle A081994.at n=18A081997
- A puzzle: reverse digits of n^2 + 10.at n=47A097990
- A puzzle: reverse digits of n^2 + 10.at n=47A097991
- Numbers n such that P(4n) is prime, where P(m) is the number of partitions of m.at n=33A111045
- This is to A139025 as A139025 to A014688, see A139025 for details.at n=18A139026
- Number of binary strings of length n with no substrings equal to 0011 0101 or 0110.at n=15A164503
- Number of 2n-digit primes that are concatenation of n two-digit distinct primes p_1...p_n, 98>p_1>p_2>...>p_n>10.at n=12A168513
- Triangle read by rows: T(n,k) is the number of n-tuples with sum k + n whose i-th element is a positive integer <= prime(i), 0 <= k < A070826(n).at n=58A239738
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 710", based on the 5-celled von Neumann neighborhood.at n=37A273423
- Numbers missing from A001032 despite satisfying the necessary congruence conditions (see comments).at n=21A274469
- Numbers missing from A134419 despite satisfying the necessary congruence conditions (see comments).at n=23A274471