269
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 270
- Proper Divisor Sum (Aliquot Sum)
- 1
- 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
- 268
- Möbius Function
- -1
- Radical
- 269
- Omega Function (Ω)
- 1
- Little Omega Function (ω)
- 1
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
- 29
- Smith Number
- no
Primality
- Prime
- yes
- Composite Number
- no
- Semiprime
- no
- Squarefree Number
- yes
- Prime Power
- yes
- Prime Factorization
- no
- Twin Prime
- yes
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 57
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Names
- German
- zweihundertneunundsechzig· ordinal: zweihundertneunundsechzigste
- English
- two hundred sixty-nine· ordinal: two hundred sixty-ninth
- Spanish
- doscientos sesenta y nueve· ordinal: 269º
- French
- deux cent soixante-neuf· ordinal: deux cent soixante-neufième
- Italian
- duecentosessantanove· ordinal: 269º
- Latin
- ducenti sexaginta novem· ordinal: 269.
- Portuguese
- duzentos e sessenta e nove· ordinal: 269º
Appears in sequences
- a(n) = number of compositions of n in which the maximum part size is 4.at n=11A000102
- Number of acyclic quaternary ammonium ions with n carbon atoms.at n=7A000633
- E.g.f. satisfies A'(x) = 1 + A(A(x)), A(0)=0.at n=5A001028
- Union of all numbers {p, q} where p and q are both primes or powers of primes and q = p+2.at n=50A001092
- Twin primes.at n=33A001097
- Primes with primitive root 2.at n=24A001122
- a(n) = floor(n*log((14/11)*n^(10/9))).at n=56A001195
- Lesser of twin primes.at n=17A001359
- Numbers k such that phi(k+2) = phi(k) + 2.at n=29A001838
- Full reptend primes: primes with primitive root 10.at n=22A001913
- Primes p such that the congruence 2^x == 3 (mod p) is solvable.at n=33A001915
- Primes p such that the congruence 2^x = 5 (mod p) is solvable.at n=31A001916
- v-pile counts for the 4-Wythoff game with i=2.at n=51A001966
- Number of partitions of n into parts 2, 3, 4, 5, 6, 7.at n=31A001996
- Pythagorean primes: primes of the form 4*k + 1.at n=25A002144
- Numbers k for which the rank of the elliptic curve y^2 = x^3 + k is 2.at n=41A002155
- Primes congruent to 1 or 2 modulo 4; or, primes of form x^2 + y^2; or, -1 is a square mod p.at n=26A002313
- Denominators of continued fraction convergents to fifth root of 2.at n=7A002361
- Expansion of a modular function for Gamma_0(21).at n=11A002511
- Number of integral points in a certain sequence of closed quadrilaterals.at n=23A002579