2515
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 13
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 3024
- Proper Divisor Sum (Aliquot Sum)
- 509
- 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
- 2008
- Möbius Function
- 1
- Radical
- 2515
- 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
- 40
- Smith Number
- yes
- 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
- Number of bipartite partitions.at n=11A002763
- Number of achiral polyominoes with n cubical cells of the regular tiling with Schläfli symbol {4,3,4} (or polycubes).at n=8A007743
- Coordination sequence T4 for Zeolite Code DAC.at n=32A008070
- Coordination sequence T1 for Zeolite Code DOH.at n=31A008078
- Coordination sequence T3 for Zeolite Code -CLO.at n=44A009852
- Coordination sequence T3 for Zeolite Code VNI.at n=31A009909
- Numbers k such that the continued fraction for sqrt(k) has period 38.at n=23A020377
- Number of distinct products ijk with 1 <= i,j,k <= n.at n=32A027425
- Numbers k such that the continued fraction for sqrt(k) has even period 2*m and the m-th term of the periodic part is 9.at n=29A031412
- Odd composite numbers n such that the digit sum of n equals digit sum of sum of its prime factors (counted with multiplicity).at n=33A036923
- Digit sum of composite odd number equals digit sum of juxtaposition of its prime factors (counted with multiplicity).at n=44A036925
- Digit sum of 'odd' number equals digit sum of 'sum' and 'juxtaposition' of its prime factors (counted with multiplicity).at n=20A036927
- Positive numbers having the same set of digits in base 5 and base 9.at n=33A037432
- Sums of 5 distinct powers of 3.at n=30A038467
- Numbers whose base-7 representation contains exactly three 2's.at n=24A043403
- Numbers n such that string 0,4 occurs in the base 9 representation of n but not of n-1.at n=33A044255
- Numbers n such that string 1,5 occurs in the base 10 representation of n but not of n-1.at n=28A044347
- Numbers n such that string 0,4 occurs in the base 9 representation of n but not of n+1.at n=33A044636
- Numbers n such that string 1,5 occurs in the base 10 representation of n but not of n+1.at n=28A044728
- Numbers whose base-5 representation contains exactly three 0's and no 1's.at n=31A045169