Properties of the Number 51440

Fifty-One Thousand Four Hundred Forty

Basics

Value: 51439 → 51440 → 51441

Parity: even

Prime: No

Previous Prime: 51439

Next Prime: 51449

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 ⁴ × 5 × 643

Divisors: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 1100100011110000

Octal: 144360

Duodecimal: 25928

Hexadecimal: c8f0

Square: 2646073600

Square Root: 226.80388003735737

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

T(n,k)=Number of 0..2 arrays of length n+2·k-1 with sum no more than 2·k in any length 2k subsequence (=50% duty cycle). A212232

T(n,k)=Number of length n+5 0..k arrays with no consecutive six elements summing to more than 3·k. A242144

Number of 0..2 arrays of length n+5 with sum no more than 6 in any length 6 subsequence (=50% duty cycle). A212227

Number of 0..2 arrays of length 5+2·n with sum no more than 2·n in any length 2n subsequence (=50% duty cycle). A212238

Number of length 6+5 0..n arrays with no consecutive six elements summing to more than 3·n. A242150

Number of 3Xn 0..1 arrays with every element equal to 1, 2 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero. A302000

Numbers k such that 7·10^k - 47 is prime. A282457

a(n) = floor(cosh(n+1) - cosh(n)). A346169

a(n) = prime(2ⁿ) + 1. A51440