1515
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 12
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 2448
- Proper Divisor Sum (Aliquot Sum)
- 933
- 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
- 800
- Möbius Function
- -1
- Radical
- 1515
- 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
- 140
- 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 trees of diameter 6.at n=8A000251
- Number of Dyck paths of knight moves.at n=12A005220
- Coordination sequence T1 for Zeolite Code AFG.at n=27A008012
- Coordination sequence T1 for Zeolite Code MOR.at n=25A008182
- Numbers k such that k | 14^k + 1.at n=30A015965
- Doublets: base-10 representation is the juxtaposition of two identical strings.at n=14A020338
- Positive numbers k such that k and 3*k are anagrams in base 7 (written in base 7).at n=6A023069
- a(n) = greatest number in row n of A026098 that is not a positive power of 2.at n=37A026104
- a(n) = (n+3)^2 - 6.at n=36A028878
- 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 11.at n=18A031509
- Number of partitions of n into parts 5k+2 or 5k+4.at n=62A035373
- Number of partitions of n with equal number of parts congruent to each of 2, 3 and 4 (mod 5).at n=41A035581
- Number of partitions of n with equal nonzero number of parts congruent to each of 0, 1 and 3 (mod 5).at n=46A035583
- a(n)=(s(n)+3)/7, where s(n)=n-th base 7 palindrome that starts with 4.at n=36A043062
- Numbers k such that 3 and 6 occur juxtaposed in the base-9 representation of k but not of k-1.at n=37A043203
- Numbers having two 5's in base 10.at n=33A043510
- Numbers k such that 3 and 6 occur juxtaposed in the base-9 representation of k but not of k+1.at n=37A043983
- Numbers k such that the string 6,3 occurs in the base 7 representation of k but not of k-1.at n=34A044183
- Numbers n such that string 5,3 occurs in the base 8 representation of n but not of n-1.at n=26A044230
- Numbers k such that the string 6,3 occurs in the base 9 representation of k but not of k-1.at n=20A044308