Properties of the Number 90681

Ninety Thousand Six Hundred Eighty-One

Basics

Value: 90680 → 90681 → 90682

Parity: odd

Prime: No

Previous Prime: 90679

Next Prime: 90697

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 167 × 181

Divisors: 1, 3, 167, 181, 501, 543, 30227, 90681

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10110001000111001

Octal: 261071

Duodecimal: 44589

Hexadecimal: 16239

Square: 8223043761

Square Root: 301.1328610430951

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) = ∑_k=0..n binomial(n,k) * binomial(n+4·k,k). A388535

a(n)=a(n-1)+floor((a(n-2)+a(n-3))/2), with a(n)=n for n<3. A214040

Expansion of (sec(x/2)² + sech(x/2)²)/2 in powers of x⁴. A90681