Properties of the Number 9211

Nine Thousand Two Hundred Eleven

Basics

Value: 9210 → 9211 → 9212

Parity: odd

Prime: No

Previous Prime: 9209

Next Prime: 9221

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 61 × 151

Divisors: 1, 61, 151, 9211

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: Yes

Tetrahedral: No

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Representations

Binary: 10001111111011

Octal: 21773

Duodecimal: 53B7

Hexadecimal: 23fb

Square: 84842521

Square Root: 95.97395480024775

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

Trajectory of n under the Reverse and Add! operation carried out in base 4 (presumably) does not reach a palindrome and (presumably) does not join the trajectory of any term m < n. A75421

E.g.f.: (1/2)/(exp(x) - 1) * (1 - (5 - 4·exp(x))^1/2). A52895

Nonprime Heinz numbers of multiples of triangular partitions, or of finite arithmetic progressions with offset 0. A325407

a(n) = (2·n + 1)*(5·n + 1). A33571

Nonnegative values·of solutions (x, y) to the Diophantine equation x²+(x+329)² = y². A205672

a(n) = prime(n) * prime(2n). A319613

Numerators of partial sums for a series for 2*ζ(2)/3 = (π²)/9. A130549

Triangle read by rows: T(n,k) = n⁴ + (n·k)² + k⁴, 1 <= k <= n. A219069

Irregular table read by rows: n-th row lists the 9 n-gonal numbers of a 3 X 3 semimagic square with the smallest magic sum. The terms of each row are arranged in the manner shown in A261816. A265141

Numerator of 3*∑_i=1..n 1/(i²*C(2·i,i)). A112093