615
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 12
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 1008
- Proper Divisor Sum (Aliquot Sum)
- 393
- 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
- 320
- Möbius Function
- -1
- Radical
- 615
- 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
- 69
- Smith 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
Names
- German
- sechshundertfünfzehn· ordinal: sechshundertfünfzehnste
- English
- six hundred fifteen· ordinal: six hundred fifteenth
- Spanish
- seiscientos quince· ordinal: 615º
- French
- six cent quinze· ordinal: six cent quinzième
- Italian
- seicentoquindici· ordinal: 615º
- Latin
- sescenti quindecim· ordinal: 615.
- Portuguese
- seiscentos e quinze· ordinal: 615º
Appears in sequences
- Numbers beginning with letter 's' in English.at n=39A000870
- Number of integral points in a certain sequence of closed quadrilaterals.at n=36A002579
- Expansion of 1/((1-x)^4*(1+x)).at n=17A002623
- Rotatable partitions.at n=28A002722
- Numbers that are the sum of 7 positive 5th powers.at n=19A003352
- Divisors of 2^20 - 1.at n=20A003529
- Divisors of 2^40 - 1.at n=28A003546
- a(n) = round(n*phi^10), where phi is the golden ratio, A001622.at n=5A004945
- a(n) = ceiling(n*phi^10), where phi is the golden ratio, A001622.at n=5A004965
- Coefficient of x^4 in expansion of (1+x+x^2)^n.at n=8A005712
- Pierce expansion for Euler's constant.at n=7A006284
- Cald's sequence: a(n+1) = a(n) - prime(n) if that value is positive and new, otherwise a(n) + prime(n) if new, otherwise 0; start with a(1)=1.at n=127A006509
- Left diagonal of partition triangle A047812.at n=9A007044
- Number of strict first-order maximal independent sets in path graph.at n=22A007383
- Number of non-Abelian metacyclic groups of order p^n (p odd).at n=31A007983
- Coordination sequence T3 for Zeolite Code MEL.at n=16A008152
- Coordination sequence T1 for Zeolite Code NON.at n=15A008212
- Coordination sequence T7 for Zeolite Code PAU.at n=18A008225
- Crystal ball sequence for planar net 3.6.3.6.at n=16A008580
- Multiples of 15.at n=41A008597