Properties of the Number 11721

Eleven Thousand Seven Hundred Twenty-One

Basics

Value: 11720 → 11721 → 11722

Parity: odd

Prime: No

Previous Prime: 11719

Next Prime: 11731

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 3907

Divisors: 1, 3, 3907, 11721

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10110111001001

Octal: 26711

Duodecimal: 6949

Hexadecimal: 2dc9

Square: 137381841

Square Root: 108.2635672791175

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

Starts of runs of 3 consecutive numbers with the same total binary weight of their divisors (A093653). A338453

Non-palindromic numbers m such that m·repunit of length k is palindromic for all large enough k. A370053

Numerators of continued fraction convergents to sqrt(271). A41508

Floor of reciprocal of ζ'(n), where ζ'(n) is the derivative of Riemann ζ function. A153517

Number of arrays of maxima of three adjacent elements of some length 7 0..n array. A228462

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 918", based on the 5-celled von Neumann neighborhood. A273748

Index of first occurrence of n appearing twice in succession in van Eck's sequence (A181391), or 0 if it never occurs. A308782

Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 72. A31570

E.g.f.: sqrt(cos(x)⁶ + sin(x)⁶). A195105

Two-dimensional array read by antidiagonals: T(n,k) = number of arrays of maxima of three adjacent elements of some length n+2 0..k array. A228461