Properties of the Number -28130

Twenty-Eight Thousand One Hundred Thirty

Basics

Value: -28131 → -28130 → -28129

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 × 5 × 29 × 97

Divisors: 1, 2, 5, 10, 29, 58, 97, 145, 194, 290

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4938 Try Today's Challenge

Representations

Binary: -110110111100010

Octal: -66742

Duodecimal: -14342

Hexadecimal: -6de2

Square: 791296900

Square Root: 167.72000476985446

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: Take a pentagon with all diagonals drawn, as in A331929. Then T(n,k) = number of k-sided polygons in that figure for k = 3, 4, ..., n+5. A331939

a(n) = 625n² - 364n + 53. A157621

Number of 3-element antichains on an unlabeled n-element set; equivalence classes of monotone Boolean functions of n variables with 3 mincuts under action of symmetric group S_n. A56778

Number of subsets of {1,2,...,n} such that no two elements differ by 1 or 5. A374737

Integers k such that there exists an integer 0<m<k such that σ(m)² + σ(k)² = 2*(m+k)². A385008

Numbers k such that the equation x² - k·y⁴ = -1 has a solution for which |y| > 2. A356488

Number of growing self-avoiding walks with displacement n on a half-infinite strip of height 5 with a trapped endpoint. A374302