Properties of the Number 81485

Eighty-One Thousand Four Hundred Eighty-Five

Basics

Value: 81484 → 81485 → 81486

Parity: odd

Prime: No

Previous Prime: 81463

Next Prime: 81509

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 5 × 43 × 379

Divisors: 1, 5, 43, 215, 379, 1895, 16297, 81485

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10011111001001101

Octal: 237115

Duodecimal: 3B1A5

Hexadecimal: 13e4d

Square: 6639805225

Square Root: 285.45577590933414

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 2^k + 21 is prime. A57201

Character of extremal vertex operator algebra of rank 43/2. A28548

Numbers k such that (73·10^k + 107)/9 is prime. A275525

T(n,k) is the number of 0..k arrays x(0..n+1) of n+2 elements with zero n-1st differences. A200272

Triangle read by rows in which the n-th row contains the smallest set of n coprime numbers with a sum which is a multiple of n. A81485

E.g.f. satisfies: A(x) = ∑_n>=0 ∏_k=1..n Integral A(x)^2·k-1 dx. A234303