2951
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 3192
- Proper Divisor Sum (Aliquot Sum)
- 241
- 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
- 2712
- Möbius Function
- 1
- Radical
- 2951
- 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
- 97
- 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
- Numbers k such that 45*2^k - 1 is prime.at n=42A002242
- a(n) = C(n,1) + C(n,2) + C(n,3), or n*(n^2 + 5)/6.at n=26A004006
- a(n) = floor(Fibonacci(n)/6).at n=22A004699
- a(n) = floor(n*phi^10), where phi is the golden ratio, A001622.at n=24A004925
- Coordination sequence T3 for Zeolite Code DDR.at n=34A008073
- Coordination sequence T1 for Zeolite Code STI.at n=37A008234
- Coordination sequence T5 for Zeolite Code -CLO.at n=48A009854
- Coordination sequence T2 for Zeolite Code iRON.at n=38A009882
- Expansion of 1/(1-x^5-x^6-x^7-x^8-x^9-x^10-x^11-x^12-x^13).at n=37A017844
- a(n) = Sum_{k=1..n} (n-k) * floor(n/k).at n=31A024920
- Coordination sequence T1 for Zeolite Code CGS.at n=40A027365
- Triangle of the cube of the normalized, unsigned Stirling matrix of the first kind.at n=7A027478
- Second subdiagonal of triangle A027478, constructed from the Stirling numbers of the first kind.at n=1A027483
- Second column of Triangle A027478, constructed from the Stirling numbers of the first kind.at n=2A027490
- Numbers having period-1 7-digitized sequences.at n=16A031201
- Numbers k such that 221*2^k+1 is prime.at n=23A032487
- Numbers whose set of base-7 digits is {1,4}.at n=35A032819
- Multiplicity of highest weight (or singular) vectors associated with character chi_128 of Monster module.at n=41A034516
- Least inverse of A015910: smallest integer k > 0 such that 2^k mod k = n, or 0 if no such k exists.at n=20A036236
- Indices of primes at which the prime race 4k-1 vs. 4k+1 is tied.at n=9A038691