545
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- yes
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 660
- Proper Divisor Sum (Aliquot Sum)
- 115
- 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
- 432
- Möbius Function
- 1
- Radical
- 545
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 43
- 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
- fünfhundertfünfundvierzig· ordinal: fünfhundertfünfundvierzigste
- English
- five hundred forty-five· ordinal: five hundred forty-fifth
- Spanish
- quinientos cuarenta y cinco· ordinal: 545º
- French
- cinq cent quarante-cinq· ordinal: cinq cent quarante-cinqième
- Italian
- cinquecentoquarantacinque· ordinal: 545º
- Latin
- quingenti quadraginta quinque· ordinal: 545.
- Portuguese
- quinhentos e quarenta e cinco· ordinal: 545º
Appears in sequences
- Number of 3-colored labeled graphs on n nodes, divided by 3.at n=3A000685
- a(n) = ceiling(n^2/2).at n=33A000982
- Number of cells of square lattice of edge 1/n inside quadrant of unit circle centered at 0.at n=26A001182
- Numbers k such that 3^k, 3^(k+1) and 3^(k+2) have the same number of digits.at n=25A001682
- Primes multiplied by 5.at n=28A001750
- Centered square numbers: a(n) = 2*n*(n+1)+1. Sums of two consecutive squares. Also, consider all Pythagorean triples (X, Y, Z=Y+1) ordered by increasing Z; then sequence gives Z values.at n=16A001844
- Number of rooted trees with n vertices in which vertices at the same level have the same degree.at n=33A003238
- Numbers that are the sum of 5 positive 4th powers.at n=33A003339
- Divisors of 2^36 - 1.at n=45A003543
- Add 4, then reverse digits; start with 0.at n=26A003608
- a(n) = 3*n^2 + 3*n - 1.at n=13A004538
- Divisible only by primes congruent to 5 mod 8.at n=39A004627
- a(n) = (n + 3)*(n^2 + 6*n + 2)/6.at n=12A005286
- Number of partitions of 5n into powers of 5.at n=59A005706
- Number of connected trivalent graphs with 2n nodes and girth exactly 7.at n=15A006927
- Add 2, then reverse digits!.at n=43A007396
- a(n) = a(n-1) + sum of digits of a(n-1), a(1) = 5.at n=48A007618
- Numbers that are the sum of 2 nonzero squares in 2 or more ways.at n=35A007692
- Number of lattice points inside circle of radius n is 4(a(n)+n)-3.at n=26A007882
- a(n) is the largest odd number k such that 9, 11, ..., k are sums of 3 of first n odd primes.at n=41A007962