169
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 3
- Divisor Sum
- 183
- Proper Divisor Sum (Aliquot Sum)
- 14
- 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
- 156
- Möbius Function
- 0
- Radical
- 13
- Omega Function (Ω)
- 2
- 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
- yes
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- yes
- 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
- yes
- Squarefree Number
- no
- Prime Power
- yes
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- yes
- Achilles Number
- no
- Perfect Power
- yes
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Names
- German
- einshundertneunundsechzig· ordinal: einshundertneunundsechzigste
- English
- one hundred sixty-nine· ordinal: one hundred sixty-ninth
- Spanish
- ciento sesenta y nueve· ordinal: 169º
- French
- cent soixante-neuf· ordinal: cent soixante-neufième
- Italian
- centosessantanove· ordinal: 169º
- Latin
- centum sexaginta novem· ordinal: 169.
- Portuguese
- cento e sessenta e nove· ordinal: 169º
Appears in sequences
- Pell numbers: a(0) = 0, a(1) = 1; for n > 1, a(n) = 2*a(n-1) + a(n-2).at n=7A000129
- Positive zeros of Bessel function of order 0 rounded to nearest integer.at n=53A000134
- Numbers that are the sum of 2 nonzero squares.at n=57A000404
- Primes and squares of primes.at n=44A000430
- n followed by n^2.at n=25A000463
- Number of nonnegative solutions to x^2 + y^2 + z^2 <= n.at n=37A000606
- Lucky numbers.at n=34A000959
- Powers of primes. Alternatively, 1 and the prime powers (p^k, p prime, k >= 1).at n=53A000961
- Powers of 13: a(n) = 13^n.at n=2A001022
- Numbers k such that sum of squares of k consecutive integers >= 1 is a square.at n=20A001032
- Numbers n such that the sum of the squares of n consecutive positive odd numbers x^2 + (x+2)^2 + ... + (x+2n-2)^2 = k^2 for some integer k. The least values of x and k for each n are in A056131 and A056132, respectively.at n=12A001033
- Numbers m such that Sum_{k=0..m-1} exp(2*Pi*i*k^3/m) != 0.at n=45A001074
- Union of all numbers {p, q} where p and q are both primes or powers of primes and q = p+2.at n=38A001092
- Number of partitions of n into squares.at n=59A001156
- Squares of primes.at n=5A001248
- Semiprimes (or biprimes): products of two primes.at n=55A001358
- a(n) is the number of partitions of n into at most 3 parts; also partitions of n+3 in which the greatest part is 3; also number of unlabeled multigraphs with 3 nodes and n edges.at n=42A001399
- Number of partitions of n into at most 4 parts.at n=24A001400
- Winning moves in Fibonacci nim.at n=29A001581
- Perfect powers: m^k where m > 0 and k >= 2.at n=17A001597