Properties of the Number 22081

Twenty-Two Thousand Eighty-One

Basics

Value: 22080 → 22081 → 22082

Parity: odd

Prime: No

Previous Prime: 22079

Next Prime: 22091

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 71 × 311

Divisors: 1, 71, 311, 22081

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101011001000001

Octal: 53101

Duodecimal: 10941

Hexadecimal: 5641

Square: 487570561

Square Root: 148.5967698168436

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

Number of regions in an equilateral triangular figure formed by the straight line segments connecting all vertices and all points that divide the sides into n equal parts. A92867

T(n,k)=Number of (n+4)X(k+4) 0..2 matrices with each 5X5 subblock idempotent. A224625

Numbers n such that there are a, b with abs(σ(a) - σ(b)) = σ(n) - n and a U b = n, where U is decimal concatenation. A239563

Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 92 ones. A31860

Number of (n+4)X6 0..2 matrices with each 5X5 subblock idempotent. A224619

Number of (n+4) X 8 0..2 matrices with each 5 X 5 subblock idempotent. A224621

Fixed points in A375564. A376584

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1001-1111-0100 pattern in any orientation. A146835

Table read by antidiagonals: Place k equally spaced points on each side of a regular n-gon and join every pair of the n*(k+1) boundary points by a chord; T(n,k) (n >= 3, k >= 0) gives the number of regions in the resulting planar graph. A367323

a(n) = (7·n + 6)⁴. A17056