129
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
- 4
- Divisor Sum
- 176
- Proper Divisor Sum (Aliquot Sum)
- 47
- 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
- 84
- Möbius Function
- 1
- Radical
- 129
- Omega Function (Ω)
- 2
- Little Omega Function (ω)
- 2
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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 121
- Smith Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- 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
- einshundertneunundzwanzig· ordinal: einshundertneunundzwanzigste
- English
- one hundred twenty-nine· ordinal: one hundred twenty-ninth
- Spanish
- ciento veintinueve· ordinal: 129º
- French
- cent vingt-neuf· ordinal: cent vingt-neufième
- Italian
- centoventinove· ordinal: 129º
- Latin
- centum viginti novem· ordinal: 129.
- Portuguese
- cento e vinte e nove· ordinal: 129º
Appears in sequences
- a(n) = 2^n + 1.at n=7A000051
- Pentanacci numbers: a(n) = a(n-1) + a(n-2) + a(n-3) + a(n-4) + a(n-5) with a(0) = a(1) = a(2) = a(3) = a(4) = 1.at n=10A000322
- a(n) = (n-1)*2^n + 1.at n=5A000337
- Numbers where total number of 1-bits in the exponents of their prime factorization is even; a 2-way classification of integers: complement of A000028.at n=67A000379
- Numbers that are the sum of 3 but no fewer nonzero squares.at n=53A000419
- 1 together with products of 2 or more distinct primes.at n=47A000469
- Sum of 7th powers: 1^7 + 2^7 + ... + n^7.at n=2A000541
- Number of steps to reach 1 in sequence A000546.at n=35A000547
- Number of nonnegative solutions of x^2 + y^2 = z in first n shells.at n=60A000592
- Number of paraffins C_n H_{2n} X_2 with n carbon atoms.at n=6A000636
- Number of asymmetrical planar partitions of n: planar partitions (A000219) that when regarded as 3-D objects have no symmetry.at n=10A000785
- Numbers beginning with a vowel in English.at n=43A000852
- Numbers ending with a vowel in American English.at n=57A000861
- Numbers beginning with letter 'o' in English.at n=30A000865
- Narayana's cows sequence: a(0) = a(1) = a(2) = 1; thereafter a(n) = a(n-1) + a(n-3).at n=14A000930
- Lucky numbers.at n=27A000959
- n! never ends in this many 0's.at n=24A000966
- Zarankiewicz's problem k_3(n).at n=13A001198
- Number of ways of making change for n cents using coins of 1, 2, 5, 10, 20, 50 cents.at n=32A001313
- Semiprimes (or biprimes): products of two primes.at n=42A001358