About the Number 505 (five hundred five)

505 was the smallest number without a nBAB on 15 June 2018.

MathBabbler Number Analyst (MBNA) output:
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505 is natural, counting, whole, integer
505 is odd (not even)
505 is not extremely odd
505 proper divisors are: 1,5,101,
505 has 3 proper divisors
505 is deficient (sum of divisors is 107; ratio: 0.211881)
505 is unhappy
505 is a Squarefree Number
505 is composite (not prime)
505 has the prime factors: 5*101 (sum=106)
505 is semiprime (biprime or 2-almost prime)
505 is a 101-smooth number
505 is sum of two squares
...505 = 12^2 + 19^2
...505 = 8^2 + 21^2
505 is undulating
505 is palindromic
505 has all palindromic proper divisors (1,5,101)
505 is in OEIS::A117746 (23; 23)alt
505 in octal is 0771
505 in hexadecimal is 0x1f9
505 in binary is 111111001 (is odious)
505 nearest square numbers: -21...24 (484...529 [23])
sqrt(505) = 22.4722
ln(505) = 6.22456
log(505) = 2.70329
505! is 3.92862e+1147
505 is 160.746 Pi years
505 is 25 score and 5 years
505 written as a Roman numeral is DV
505 is 253^2 - 252^2 and 253 + 252 = 505
505 is a multiple of 5 & it contains a 5 (A121025)
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505 reciprocal is 0.00198
remainders: 
1,10,100,495,405,10

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 15 June 2018

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This work is licensed under a Creative Commons Attribution 3.0 United States License.