Properties of the Number 81871

Eighty-One Thousand Eight Hundred Seventy-One

Basics

Value: 81870 → 81871 → 81872

Parity: odd

Prime: No

Previous Prime: 81869

Next Prime: 81883

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 19 × 31 × 139

Divisors: 1, 19, 31, 139, 589, 2641, 4309, 81871

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10011111111001111

Octal: 237717

Duodecimal: 3B467

Hexadecimal: 13fcf

Square: 6702860641

Square Root: 286.131088838665

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

Index of first occurrence of n appearing twice in succession in van Eck's sequence (A181391), or 0 if it never occurs. A308782

a(1)=1, a(n)=2·a(n-1)+1 if that number is composite, a(n)=a(n-1)+1 otherwise. A81871