Properties of the Number 505

Five Hundred Five

Basics

Value: 504 → 505 → 506

Parity: odd

Prime: No

Previous Prime: 503

Next Prime: 509

Digit Sum: 10

Digital Root: 1

Palindrome: Yes

Factorization: 5 × 101

Divisors: 1, 5, 101, 505

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111111001

Octal: 771

Duodecimal: 361

Hexadecimal: 1f9

Square: 255025

Square Root: 22.47220505424423

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Palindromes in base 10. A2113

Number of partitions of n into an even number of parts. A27187

a(n) = n + (n+1)². A28387

a(n) = n*(n² + 1)/2. A6003

Number of ordered triples (w,x,y) with all terms in {-n,...,0,...,n} and w² + x·y = 0. A211422

Sum of remainders of n mod k, for k = 1, 2, 3, ..., n. A4125

Start with 1 and repeatedly reverse the decimal digits and add 4 to get the next term. A117828

a(n) = 10·n + 5. A17329

Numbers whose sum of digits is 10. A52224

Square array, read by antidiagonals, where row n equals the crystal ball sequence for the A_n lattice. A108625