969
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 24
- Digital Root
- 6
- Palindromic Number
- yes
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 1440
- Proper Divisor Sum (Aliquot Sum)
- 471
- 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
- 576
- Möbius Function
- -1
- Radical
- 969
- 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
- yes
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 49
- 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
- neunhundertneunundsechzig· ordinal: neunhundertneunundsechzigste
- English
- nine hundred sixty-nine· ordinal: nine hundred sixty-ninth
- Spanish
- novecientos sesenta y nueve· ordinal: 969º
- French
- neuf cent soixante-neuf· ordinal: neuf cent soixante-neufième
- Italian
- novecentosessantanove· ordinal: 969º
- Latin
- nongenti sexaginta novem· ordinal: 969.
- Portuguese
- novecentos e sessenta e nove· ordinal: 969º
Appears in sequences
- Tetrahedral (or triangular pyramidal) numbers: a(n) = C(n+2,3) = n*(n+1)*(n+2)/6.at n=17A000292
- a(n) = 1^2 + 3^2 + 5^2 + 7^2 + ... + (2*n-1)^2 = n*(4*n^2 - 1)/3.at n=9A000447
- 9-gonal (or enneagonal or nonagonal) numbers: a(n) = n*(7*n-5)/2.at n=17A001106
- Numbers in which every digit contains at least one loop (version 1).at n=55A001743
- Number of dissections of a polygon: binomial(4*n, n)/(3*n + 1).at n=5A002293
- Odd squarefree numbers with an odd number of prime factors that have no prime factors greater than 31.at n=40A002556
- Tetrahedral numbers written backwards.at n=17A004161
- a(n)=least number m such that m-a(n-1)<>a(j)-a(k) for all j,k less than m; a(1)=1, a(2)=3.at n=30A004979
- Expansion of (1-x+x^2)/((1-x)^2*(1-x^2)*(1-x^4)).at n=33A005232
- Palindromic tetrahedral numbers.at n=2A006030
- Add 2, then reverse digits!.at n=57A007396
- Coordination sequence T2 for Zeolite Code BOG.at n=22A008050
- Coordination sequence T1 for Zeolite Code ACO, ASV, EDI, and THO.at n=22A008084
- Coordination sequence T10 for Zeolite Code EUO.at n=19A008096
- Coordination sequence T1 for Zeolite Code FAU.at n=26A008105
- Coordination sequence T1 for Zeolite Code MEL.at n=20A008150
- Coordination sequence T1 for Zeolite Code MOR.at n=20A008182
- Coordination sequence T2 for Zeolite Code THO.at n=22A008239
- Number of orbits on points that are at n steps from 0 in D_9 lattice.at n=12A008374
- Multiples of 19.at n=51A008601