2595
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 21
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 4176
- Proper Divisor Sum (Aliquot Sum)
- 1581
- 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
- 1376
- Möbius Function
- -1
- Radical
- 2595
- 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
- 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
- 102
- 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
- Number of partitions of n into partition numbers.at n=42A007279
- Coordination sequence T6 for Zeolite Code DDR.at n=32A008076
- Coordination sequence T2 for Zeolite Code MTT.at n=31A008190
- a(n) = n*(23*n + 1)/2.at n=15A022281
- Sequence satisfies T^2(a)=a, where T is defined below.at n=44A027585
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 15.at n=24A031513
- Numbers with exactly five distinct base-7 digits.at n=23A031984
- Number of partitions of n into parts not of form 4k+2, 24k, 24k+9 or 24k-9. Also number of partitions in which no odd part is repeated, with at most 4 parts of size less than or equal to 2 and where differences between parts at distance 5 are greater than 1 when the smallest part is odd and greater than 2 when the smallest part is even.at n=38A036033
- Number of columns in all directed column-convex polyominoes of area n+1.at n=7A038731
- Number of partitions satisfying cn(1,5) < cn(0,5) + cn(2,5) + cn(3,5) and cn(4,5) < cn(0,5) + cn(2,5) + cn(3,5).at n=29A039872
- Denominators of continued fraction convergents to sqrt(133).at n=11A041243
- Denominators of continued fraction convergents to sqrt(532).at n=7A042017
- Numbers having three 0's in base 6.at n=27A043371
- Numbers n such that string 0,3 occurs in the base 9 representation of n but not of n-1.at n=34A044254
- Numbers n such that string 9,5 occurs in the base 10 representation of n but not of n-1.at n=27A044427
- Numbers n such that string 0,3 occurs in the base 9 representation of n but not of n+1.at n=34A044635
- Numbers k such that string 9,5 occurs in the base 10 representation of k but not of k+1.at n=27A044808
- Numbers whose base-5 representation contains exactly two 0's and two 4's.at n=32A045212
- a(n) = floor(47*(n-3/2)^(3/2)).at n=14A050256
- a(n) = least value such that sequence increases and pairwise differences are unique.at n=39A058336