Properties of the Number 81478

Eighty-One Thousand Four Hundred Seventy-Eight

Basics

Value: 81477 → 81478 → 81479

Parity: even

Prime: No

Previous Prime: 81463

Next Prime: 81509

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 2 × 40739

Divisors: 1, 2, 40739, 81478

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10011111001000110

Octal: 237106

Duodecimal: 3B19A

Hexadecimal: 13e46

Square: 6638664484

Square Root: 285.44351455235415

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

Number of monohedral disk tilings of type C^t_{3,n}. A296361

Indices k such that 15 plus the k-th triangular number is a perfect square. A154145

Consider the mapping f(a/b) = (a - b)/(ab). Taking a = 2 and b = 1 to start with and carrying out this mapping repeatedly on each new (reduced) rational number gives the following sequence 2/1,1/2,-1/2,-3/-2,-1/6,... Sequence contains the denominators. A81478