Properties of the Number 81802

Eighty-One Thousand Eight Hundred Two

Basics

Value: 81801 → 81802 → 81803

Parity: even

Prime: No

Previous Prime: 81799

Next Prime: 81817

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 × 7 × 5843

Divisors: 1, 2, 7, 14, 5843, 11686, 40901, 81802

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10011111110001010

Octal: 237612

Duodecimal: 3B40A

Hexadecimal: 13f8a

Square: 6691567204

Square Root: 286.0104893181367

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 T, read by rows, that satisfies: T(n,k) = [T²](n-1,k) for n>k+1>=1, with T(n,n) = 1 and T(n+1,n) = n+1 for n>=0, where T² is the matrix square of T. A109152

Column 0 of triangle A109152. A109153

Triangle read by rows: T(n, k) is the number of k-dimensional subspaces in (F₅)ⁿ, counted up to coordinate permutation (n >= 0, 0 <= k <= n). A347972

Numbers whose second arithmetic derivative (A068346) is a primorial number (A002110) > 1. A368702

G.f. A(x) satisfies a(n) = [xⁿ] ( A(x)^n-1 - 2·A(x)ⁿ + A(x)ⁿ⁺¹ ) for n > 1, with a(0) = a(1) = 1. A384264

Primes p such that the arithmetic mean of the fractional parts of p/1, p/2, ..., p/p is larger than 1 - γ = 0.422784... A109996

Primes where the arithmetic mean of the fractional parts of p/1,p/2,..., p/p is less than 1-γ=0.422784... A109997

Decimal expansion of electron charge 1.602177330000·10-19 (Coulomb). A81802