Properties of the Number 81407

Eighty-One Thousand Four Hundred Seven

Basics

Value: 81406 → 81407 → 81408

Parity: odd

Prime: No

Previous Prime: 81401

Next Prime: 81409

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 127 × 641

Divisors: 1, 127, 641, 81407

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011110111111111

Octal: 236777

Duodecimal: 3B13B

Hexadecimal: 13dff

Square: 6627099649

Square Root: 285.31911958366896

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

a(n) = (4·n + 3)*(1 + 2·n²)/3. A168574

Expansion of (1-x)^-1/(1+2·x-2·x³). A77924

Composite numbers k = concat(MSD(k),x) such that the sum of the aliquot parts of k is equal to the sum of the aliquot parts of x. A293479

4th-order non-linear ("factorial") recursion: a(0)=a(1)=a(2)=a(3)=1, a(n) = (n+1)*a(n-4). A81407