Properties of the Number 81815

Eighty-One Thousand Eight Hundred Fifteen

Basics

Value: 81814 → 81815 → 81816

Parity: odd

Prime: No

Previous Prime: 81799

Next Prime: 81817

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 5 × 16363

Divisors: 1, 5, 16363, 81815

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111110010111

Octal: 237627

Duodecimal: 3B41B

Hexadecimal: 13f97

Square: 6693694225

Square Root: 286.033214854499

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

a(n) is the least k such that the remainder when 8^k is divided by k is n. A119714

Number of nondecreasing arrangements of n+3 numbers in 0..4 with each number being the sum mod 5 of three others. A183899

Number of (n+2)X(1+2) nonnegative integer arrays with all values the knight distance from the upper left minus as much as 1, with successive minimum path knight move differences either 0 or +1, and any unreachable value zero. A253417

Number of nX4 0..1 arrays with every element equal to 0, 1, 2, 3, 5 or 8 king-move adjacent elements, with upper left element zero. A299341

Decimal expansion of electron charge to mass quotient (negated). A81815