2501
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 8
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 2604
- Proper Divisor Sum (Aliquot Sum)
- 103
- 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
- 2400
- Möbius Function
- 1
- Radical
- 2501
- 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
- yes
- 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
- 27
- 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
- Pentagonal numbers: a(n) = n*(3*n-1)/2.at n=41A000326
- Numbers m such that Fibonacci(m) ends with m.at n=46A000350
- Hexanacci numbers with a(0) = ... = a(5) = 1.at n=15A000383
- a(n) = n^2 + 1.at n=50A002522
- Numbers k such that k^4 can be written as a sum of four positive 4th powers.at n=11A003294
- a(n) = 1 + a(floor(n/2))*a(ceiling(n/2)).at n=19A005468
- Coordination sequence T1 for Zeolite Code MEL.at n=32A008150
- Coordination sequence T2 for Moganite, also for BGB1.at n=32A008259
- Coordination sequence T2 for Zeolite Code DFO.at n=38A009876
- Coordination sequence T1 for Zeolite Code VSV.at n=32A009914
- Odd pentagonal numbers.at n=20A014632
- Pseudoprimes to base 8.at n=35A020137
- Pseudoprimes to base 9.at n=25A020138
- Pseudoprimes to base 20.at n=15A020148
- Pseudoprimes to base 23.at n=27A020151
- Pseudoprimes to base 33.at n=15A020161
- Pseudoprimes to base 37.at n=40A020165
- Pseudoprimes to base 50.at n=26A020178
- Pseudoprimes to base 62.at n=25A020190
- Pseudoprimes to base 72.at n=16A020200