Properties of the Number 91820

Ninety-One Thousand Eight Hundred Twenty

Basics

Value: 91819 → 91820 → 91821

Parity: even

Prime: No

Previous Prime: 91813

Next Prime: 91823

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 ² × 5 × 4591

Divisors: 1, 2, 4, 5, 10, 20, 4591, 9182, 18364, 22955

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10110011010101100

Octal: 263254

Duodecimal: 45178

Hexadecimal: 166ac

Square: 8430912400

Square Root: 303.0181512715039

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) = T(n,0) + T(n,1) + ... + T(n,[ n/2 ]), T given by A026714. A26722

Number of ways to reach a sum of n by a down-only cascade through Pascal's Triangle, starting at C(0,0)=1 at the apex and shifting left or right by exactly one position at each step. A91820