Properties of the Number 91881

Ninety-One Thousand Eight Hundred Eighty-One

Basics

Value: 91880 → 91881 → 91882

Parity: odd

Prime: No

Previous Prime: 91873

Next Prime: 91909

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ³ × 41 × 83

Divisors: 1, 3, 9, 27, 41, 83, 123, 249, 369, 747

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: Yes

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Representations

Binary: 10110011011101001

Octal: 263351

Duodecimal: 45209

Hexadecimal: 166e9

Square: 8442118161

Square Root: 303.11878859615416

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) = 1² + 3² + 5² + 7² + ... + (2·n-1)² = n*(4·n² - 1)/3. A447

Odd tetrahedral numbers: a(n) = (4·n+1)*(4·n+2)*(4·n+3)/6. A15219

a(n) = binomial(prime(n+2), 3). A126995

a(n) = binomial(3·n+2,3). A228888

Binomial coefficients C(83,n). A17799

Binomial coefficients C(n,80). A17744

Sequence related to Hankel transform of super-ballot numbers. A156126

Number of 4-member subsets of [4·n] whose elements sum to a multiple of n. A318625

Tetrahedral numbers that are not divisible by any smaller tetrahedral number except 1. A318701

a(n) = (prime(n) - 1)*(prime(n) - 3)*(prime(n) - 5)/48. A30004