Properties of the Number 81705

Eighty-One Thousand Seven Hundred Five

Basics

Value: 81704 → 81705 → 81706

Parity: odd

Prime: No

Previous Prime: 81703

Next Prime: 81707

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 5 × 13 × 419

Divisors: 1, 3, 5, 13, 15, 39, 65, 195, 419, 1257

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111100101001

Octal: 237451

Duodecimal: 3B349

Hexadecimal: 13f29

Square: 6675707025

Square Root: 285.84086481817116

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

Number of partitions p of n such that min(p) < (number of parts of p) < max(p). A325340

Constant term of the reduction by x²->x+1 of the polynomial p(n,x) defined below in Comments. A192749

k-tuple abundance of abundant numbers. A81705

Table read by antidiagonals: Place k equally spaced points on each side of a regular n-gon and join every pair of these n·k points by a chord; T(n,k) (n >= 3, k >= 0) gives the number of internal vertices in the resulting planar graph. A367303