2497
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 2736
- Proper Divisor Sum (Aliquot Sum)
- 239
- 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
- 2260
- Möbius Function
- 1
- Radical
- 2497
- 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
- 89
- 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
- Numerators of coefficients for numerical integration.at n=4A002195
- Coordination sequence T2 for Zeolite Code ATS.at n=36A008039
- Coordination sequence T3 for Zeolite Code GOO.at n=34A008113
- Expansion of log(1+tan(x))/cosh(x).at n=7A009373
- A B_2 sequence: a(n) = least value such that sequence increases and pairwise sums of distinct elements are all distinct.at n=39A011185
- Integers that are squarefree and also the sum of first k squarefrees for some k.at n=33A013932
- Coordination sequence T3 for Zeolite Code SAO.at n=39A019573
- Numbers k such that the continued fraction for sqrt(k) has period 56.at n=4A020395
- Odd elements in 3-Pascal triangle A028262 (by row).at n=70A028264
- Odd elements in 3-Pascal triangle A028262 (by row) that are not 1.at n=42A028265
- Odd elements in 3-Pascal triangle A028262 (by row) that are not 1.at n=45A028265
- Number of distinct elements in 3-Pascal triangle A028262 (by row).at n=44A028267
- Distinct odd elements in 3-Pascal triangle A028262 (by row).at n=23A028268
- Elements to right of central elements in 3-Pascal triangle A028262.at n=50A028271
- Elements to right of central elements in 3-Pascal triangle A028262 that are not 1.at n=37A028272
- Odd elements (greater than 1) to right of central elements in 3-Pascal triangle A028262.at n=20A028274
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 28 ones.at n=10A031796
- Numbers k such that 231*2^k+1 is prime.at n=40A032492
- All slopes (a(n)-a(m))/(n-m) are distinct; generated from 0 by greedy algorithm.at n=44A033808
- a(n) = floor(T_(n+1)/T_(n)) where T_n is n-th tangential or "Zag" number (see A000182).at n=38A034972