Properties of the Number 91665

Ninety-One Thousand Six Hundred Sixty-Five

Basics

Value: 91664 → 91665 → 91666

Parity: odd

Prime: No

Previous Prime: 91639

Next Prime: 91673

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ³ × 5 × 7 × 97

Divisors: 1, 3, 5, 7, 9, 15, 21, 27, 35, 45

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 10110011000010001

Octal: 263021

Duodecimal: 45069

Hexadecimal: 16611

Square: 8402472225

Square Root: 302.7622829878253

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

Triangle read by rows: T(n,k) is the number of sets of noncrossing paths of size k that cover n nodes arranged in a circle with one node paths allowed, 0 <= k <= n. A390894

Expansion of 1/2 * ∏_{i>=0, j>=0, k>=0} (1 + x^{i² + j² + k²}). A321381

Odd numbers k such that gcd(A276086(σ(k)-k), A276086(k)) is equal to A276086(k), where A276086 is the primorial base exp-function, and σ is the sum of divisors function. A388267

a(0) = a(1) = 1. a(n) = a(n-1) + a(n - b(n)), where b(n) is largest prime dividing n. A137809

a(n) = (2n+1)!! mod (2n)!! where k!! = A006882(k). A306184

a(n) = (n-1)*(n+2)*(2·n+11)/2. A130862

a(n) = (n+1)!! mod n!!. A227415

Number of vertices of even degree in a cubic lattice n X n X n. A383585

First element of the first maximal isospectral chain of length n. A330849

First elements of maximal isospectral chains of length 4. A335083