Properties of the Number 87561

Eighty-Seven Thousand Five Hundred Sixty-One

Basics

Value: 87560 → 87561 → 87562

Parity: odd

Prime: No

Previous Prime: 87559

Next Prime: 87583

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ⁴ × 23 × 47

Divisors: 1, 3, 9, 23, 27, 47, 69, 81, 141, 207

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 10101011000001001

Octal: 253011

Duodecimal: 42809

Hexadecimal: 15609

Square: 7666928721

Square Root: 295.90708000992475

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

T(n,k)=Number of nXk 0..1 arrays with every element equal to 1, 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. A300930

a(n) = a(n-1) + a(n-2) + 7 where a(0) = a(1) = 1. A111733

Number of nX4 0..1 arrays with every element equal to 1, 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. A300926

Number of nX5 0..1 arrays with every element equal to 1, 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. A300927

Number of solutions to x² + 2y² == 0 (mod n). A87561