2495
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 3000
- Proper Divisor Sum (Aliquot Sum)
- 505
- 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
- 1992
- Möbius Function
- 1
- Radical
- 2495
- 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
- 71
- 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
- Coordination sequence T4 for Zeolite Code SGT.at n=31A008232
- Expansion of (1+x^10)/((1-x)*(1-x^2)*(1-x^3)*(1-x^4)).at n=56A008771
- Coordination sequence T2 for Zeolite Code -WEN.at n=36A009863
- Coordination sequence T1 for Zeolite Code ZON.at n=35A009919
- Coordination sequence T4 for Zeolite Code ZON.at n=35A009922
- a(n) = round( Gamma(n+3/4)/Gamma(3/4) ).at n=7A020041
- a(n) = floor( Gamma(n + 3/4)/Gamma(3/4) ).at n=7A020086
- Fibonacci sequence beginning 1, 6.at n=14A022096
- Least m such that if r and s in {1/2, 1/5, 1/8,..., 1/(3n-1)}, satisfy r < s, then r < k/m < s for some integer k.at n=33A024823
- a(n) = least m such that if r and s in {1/1, 1/2, 1/3, ..., 1/n} satisfy r < s, then r < k/m < (k+2)/m < s for some integer k.at n=30A024840
- a(n) = T(n,2n-1), T given by A027023.at n=9A027050
- Coordination sequence T2 for Zeolite Code ITE.at n=34A027370
- Decimal part of a(n)^(1/2) starts with reversal of its integer part: first term of runs.at n=33A034308
- a(n) = least number not of form [ (a^2+b^2)/n ].at n=20A036574
- Expansion of (3 + x^2) / (1 - x)^4.at n=14A037237
- Denominators of continued fraction convergents to sqrt(463).at n=9A041883
- Numbers whose base-3 representation has exactly 8 runs.at n=13A043588
- Numbers whose base-7 representation has exactly 5 runs.at n=33A043620
- Numbers whose number of runs in base 3 is congruent to 1 (mod 7).at n=27A043792
- Numbers n such that number of runs in the base 3 representation of n is congruent to 0 mod 8.at n=13A043798