Properties of the Number -81080

Eighty-One Thousand Eighty

Basics

Value: -81081 → -81080 → -81079

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 ³ × 5 × 2027

Divisors: 1, 2, 4, 5, 8, 10, 20, 40, 2027, 4054

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8109 Try Today's Challenge

Representations

Binary: -10011110010111000

Octal: -236270

Duodecimal: -3AB08

Hexadecimal: -13cb8

Square: 6573966400

Square Root: 284.7455004034304

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

Numbers k such that both k and k+1 are abundant. A96399

Triangle read by rows giving the coefficients of formulas generating each variety of S1(n,k) (unsigned Stirling numbers of first kind). The p-th row (p>=1) contains T(i,p) for i=1 to 2·p, where T(i,p) satisfies ∑_i=1..2·p T(i,p) * C(n,i). A94216

Numbers k such that both σ(k) >= 2·k-1 and σ(k+1) >= 2*(k+1)-1. A103289

Numbers k such that both k and k+1 are Zumkeller numbers (A083207). A328327

Number of nonempty subsets of {1,2,...,n} in which exactly 3/4 of the elements are <= (n-2)/3. A48020

Number of nonempty subsets of {1,2,...,n} in which exactly 3/4 of the elements are <= (n-3)/3. A48031

Coefficients of expansion polynomial:p(x,t)=Exp[ -t²* x](1 - t)^-x/x. A174893