Properties of the Number 12691

Twelve Thousand Six Hundred Ninety-One

Basics

Value: 12690 → 12691 → 12692

Parity: odd

Prime: No

Previous Prime: 12689

Next Prime: 12697

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 7 ³ × 37

Divisors: 1, 7, 37, 49, 259, 343, 1813, 12691

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11000110010011

Octal: 30623

Duodecimal: 7417

Hexadecimal: 3193

Square: 161061481

Square Root: 112.65433857601757

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

Centered cube numbers: n³ + (n+1)³. A5898

Centered cube numbers that can be written as sums of two other cubes in at least one way. A352133

Palindromic numbers in bases 4 and 6 written in base 10. A259376

21-gonal numbers: a(n) = n*(19n - 17)/2. A51873

Numbers whose prime indices have more than one permutation with all equal run-sums. A383015

Numbers having exactly four representations by the quadratic form x²+xy+y² with 0<=x<=y. A198775

Row sums of the triangular array A246694. A246695

Numbers which are the sum of two positive cubes and divisible by 37. A102618

Triangle read by rows in which row n lists n+1 terms, starting with n⁴ and ending with n⁵, such that the difference between successive terms is equal to n⁴ - n³. A163284

Numbers that are the sum of two (possibly negative) cubes in at least 2 ways. A51347