Properties of the Number -261891

Two Hundred Sixty-One Thousand Eight Hundred Ninety-One

Basics

Value: -261892 → -261891 → -261890

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 7 × 4157

Divisors: 1, 3, 7, 9, 21, 63, 4157, 12471, 29099, 37413

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -111111111100000011

Octal: -777403

Duodecimal: -107683

Hexadecimal: -3ff03

Square: 68586895881

Square Root: 511.7528700456891

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) = (-1)ⁿ * coefficient of xⁿ in ∑_k>=1 x^k-1/(1+4·x^k). A101562

Upper (2/3)-midsequence of A000032 (Lucas numbers) and A000045 (Fibonacci numbers); see Comments. A389122