Properties of the Number 9721

Nine Thousand Seven Hundred Twenty-One

Basics

Value: 9720 → 9721 → 9722

Parity: odd

Prime: Yes

Previous Prime: 9719

Next Prime: 9733

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 9721

Divisors: 1, 9721

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10010111111001

Octal: 22771

Duodecimal: 5761

Hexadecimal: 25f9

Square: 94497841

Square Root: 98.59513172565875

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

Primes of form n² + 4096. A256836

Numbers n such that n, n+1 and n+2 are 1,2,3-almost primes. A112998

Smallest value of·such that M(x) = -n, where M(x) is Mertens's function A002321. A51401

a(1) = 1; for n>1, a(n) = the largest prime divisor of the number C(n) formed from the concatenation of 1,2,3,... up to n. A75022

a(n) = 6·n² + 3·n + 1. A85473

Triangle read by rows: T(n,k) = 30·k²*(n-k)² + 1; n >= 0, 0 <= k <= n. A300656

Centered triangular numbers that are prime. A125602

Values of A (the short leg) of a Pythagorean triangle with A and C (the hypotenuse) both prime and part of a twin prime. A51642

a(n) = largest prime divisor of A138957(n). A138961

a(n) = 30·n² + 1. A158558