Properties of the Number 11921

Eleven Thousand Nine Hundred Twenty-One

Basics

Value: 11920 → 11921 → 11922

Parity: odd

Prime: No

Previous Prime: 11909

Next Prime: 11923

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 7 × 13 × 131

Divisors: 1, 7, 13, 91, 131, 917, 1703, 11921

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10111010010001

Octal: 27221

Duodecimal: 6A95

Hexadecimal: 2e91

Square: 142110241

Square Root: 109.1833320612629

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(1)=1, a(n)=a(n-1)+n if n odd, a(n)=a(n-1)+ n² if n is even. A140113

Number of subsets of {1..n} of which every subset has a different sum. A325864

Partial sums of ceiling(n²/2) (A000982). A131941

Alkane (or paraffin) numbers l(7,n). A5994

Structured hexagonal diamond numbers (vertex structure 5). A100178

Odd composite integers m such that A006497(m) == 3 (mod m). A335669

Fundamental discriminants of real quadratic number fields with class number 10. A218160

a(n) = n*(n-1)*(2·n² + 1)/6. A71245

Cycle of the inventory sequence (as in A063850) starting with n consists of prime numbers. A78970

Non-palindromic numbers m such that m·repunit of length k is palindromic for all large enough k. A370053