Properties of the Number 8381

Eight Thousand Three Hundred Eighty-One

Basics

Value: 8380 → 8381 → 8382

Parity: odd

Prime: No

Previous Prime: 8377

Next Prime: 8387

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 17 ² × 29

Divisors: 1, 17, 29, 289, 493, 8381

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 10000010111101

Octal: 20275

Duodecimal: 4A25

Hexadecimal: 20bd

Square: 70241161

Square Root: 91.54780172128658

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

The first Fibonacci based variant of arithmetic derivative: a(p) = A000045(p) for prime p, a(u·v) = a(u)*v + u·a(v), with a(0) = a(1) = 0. A328845

Numbers k > 1 such that, in base 4, k and k² contain the same digits in the same proportion. A61658

Sum of n and partition number of n. A133041

Square array A(n,k), read by descending antidiagonals, where A(1, k) = A388984(k), and for n > 1, A(n, k) = A003961(A(n-1), k). A388981

Triangle read by rows, in which n-th row contains smallest set of n consecutive numbers with distinct prime signatures. A83788

a(n) = 29·n². A244635

Numerators of row 4 of table described in A051714/A051715. A51722

Where records occur in A239656 (the first differences of sphenic numbers). A239674

Number of one-sided polynars with n cells. A390621

Number of terms (excluding the first) of A002211 for which the geometric mean produces progressively better approximations to Khinchin's constant (itself). A48613