Properties of the Number 81085

Eighty-One Thousand Eighty-Five

Basics

Value: 81084 → 81085 → 81086

Parity: odd

Prime: No

Previous Prime: 81083

Next Prime: 81097

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 5 × 16217

Divisors: 1, 5, 16217, 81085

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011110010111101

Octal: 236275

Duodecimal: 3AB11

Hexadecimal: 13cbd

Square: 6574777225

Square Root: 284.7542800380707

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

Integer part of log(n)^{n - 1}. A62415

Number of -4..4 arrays x(i) of n+1 elements i=1..n+1 with x(i)+x(j), x(i+1)+x(j+1), -(x(i)+x(j+1)), and -(x(i+1)+x(j)) having one, two or three distinct values for every i<=n and j<=n. A211690

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0111-0100 pattern in any orientation. A146465

Expansion of 1 / AGM(1, 1 - 8·x) in powers of x. A81085