Properties of the Number -218751

Two Hundred Eighteen Thousand Seven Hundred Fifty-One

Basics

Value: -218752 → -218751 → -218750

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 13 × 71 × 79

Divisors: 1, 3, 13, 39, 71, 79, 213, 237, 923, 1027

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -110101011001111111

Octal: -653177

Duodecimal: -A6713

Hexadecimal: -3567f

Square: 47852000001

Square Root: 467.7082423904886

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 series-reduced planted trees with n leaves. Also the number of essentially series series-parallel networks with n edges; also the number of essentially parallel series-parallel networks with n edges. A669

(2·16^5ⁿ - 1) mod 10ⁿ: a sequence of trimorphic numbers ending in 1. A224474

Smallest number m > 1 such that m² == 1 (mod 10ⁿ). A181539

Numbers n with k digits such that n² == 1 (mod 10^k). A181607

Numbers whose squares have 2R-1 digits, such that the number represented by leftmost R digits and number represented by rightmost R digits divide each other evenly. A216233

Trimorphic but not bimorphic nor automorphic. A56032

Numbers n such that the product of proper divisors of n ends with n and n is not a multiplicatively perfect number (A007422). A278474