Properties of the Number 9639

Nine Thousand Six Hundred Thirty-Nine

Basics

Value: 9638 → 9639 → 9640

Parity: odd

Prime: No

Previous Prime: 9631

Next Prime: 9643

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ⁴ × 7 × 17

Divisors: 1, 3, 7, 9, 17, 21, 27, 51, 63, 81

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10010110100111

Octal: 22647

Duodecimal: 56B3

Hexadecimal: 25a7

Square: 92910321

Square Root: 98.17840903172143

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

a(n)=a(n-1)+a(m), where m=2n-2-2^p+1 and 2^p<n-1<=2^p+1, for n >= 4. A50067

Numbers k such that k⁴ can be written as a sum of four positive 4th powers with no common factor. A39664

Values of n such that there are exactly 10 solutions to x² - y² = n with x > y >= 0. A257417

Numbers k such that the sum of the digits of k equals the sum of the prime divisors of k. A70275

Iccanobirt numbers (6 of 15): a(n) = R(a(n-1)) + R(a(n-2)) + a(n-3), where R is the digit reversal function A004086. A102116

Positive numbers of the form -x⁴+6x² y²-y⁴ (where x,y are integers). A135790

Number of simple, connected, unit-distance graphs on n points realizable in the plane with straight edges all of the same length; lines are permitted to cross. A59103

a(n) = Fibonacci(n)*A109041(n) for n>=1, with a(0)=1, where A109041 lists the coefficients in η(q)⁹/η(q³)³. A205973

Odd composite integers m such that A006190(2·m-J(m,13)) == 1 (mod m), where J(m,13) is the Jacobi symbol. A340119

Number of dominating sets in the n-trapezohedral graph. A370089