7107
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 15
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 9984
- Proper Divisor Sum (Aliquot Sum)
- 2877
- 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
- 4488
- Möbius Function
- -1
- Radical
- 7107
- Omega Function (Ω)
- 3
- 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
- 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
- 57
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- Pseudoprimes to base 10.at n=25A005939
- Odd pentagonal numbers.at n=34A014632
- Pseudoprimes to base 13.at n=23A020141
- Pseudoprimes to base 14.at n=25A020142
- Pseudoprimes to base 22.at n=36A020150
- Pseudoprimes to base 31.at n=29A020159
- Pseudoprimes to base 61.at n=47A020189
- Pseudoprimes to base 79.at n=31A020207
- Pseudoprimes to base 80.at n=40A020208
- Pseudoprimes to base 94.at n=46A020222
- Pseudoprimes to base 95.at n=29A020223
- Pseudoprimes to base 100.at n=38A020228
- Strong pseudoprimes to base 13.at n=3A020239
- Strong pseudoprimes to base 64.at n=27A020290
- Strong pseudoprimes to base 80.at n=12A020306
- Strong pseudoprimes to base 89.at n=12A020315
- Strong pseudoprimes to base 100.at n=17A020326
- Pentagonal numbers with odd index: a(n) = (2*n+1)*(3*n+1).at n=34A033570
- STIRLING transform of [1,1,2,4,8,16,32,...].at n=7A035009
- Numbers having three 6's in base 9.at n=32A043479