Properties of the Number 12721

Twelve Thousand Seven Hundred Twenty-One

Basics

Value: 12720 → 12721 → 12722

Parity: odd

Prime: Yes

Previous Prime: 12713

Next Prime: 12739

Digit Sum: 13

Digital Root: 4

Palindrome: Yes

Factorization: 12721

Divisors: 1, 12721

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11000110110001

Octal: 30661

Duodecimal: 7441

Hexadecimal: 31b1

Square: 161823841

Square Root: 112.78741064498288

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

Palindromic primes: prime numbers whose decimal expansion is a palindrome. A2385

Primes of the form k(k+1)/2+1 (i.e., central polygonal numbers, or one more than triangular numbers). A55469

Mountain primes. A134951

Primes of the form 9x² + 6xy + 1849y². A244019

Primes p such that (p+1)/2, (p+2)/3 and (p+3)/4 are also primes. A163573

Class 6+ primes. A81634

Primes having only {1, 2, 7} as digits. A260889

Numbers whose least quadratic nonresidue (A020649) is 13. A25025

Primes p such that (p+1)/2 and (p+2)/3 are also primes. A36570

Number of cyclic subgroups of the group C_n x C_n x C_n x C_n, where C_n is the cyclic group of order n. A280184