Properties of the Number 10991

Ten Thousand Nine Hundred Ninety-One

Basics

Value: 10990 → 10991 → 10992

Parity: odd

Prime: No

Previous Prime: 10987

Next Prime: 10993

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 29 × 379

Divisors: 1, 29, 379, 10991

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10101011101111

Octal: 25357

Duodecimal: 643B

Hexadecimal: 2aef

Square: 120802081

Square Root: 104.83797022071727

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

The n-th n-gonal number: a(n) = n*(n² - 3·n + 4)/2. A60354

Composite numbers whose divisors (except 1) all contain the digit 9. A62680

29-gonal numbers: a(n) = n*(27·n-25)/2. A255187

Numbers k such that σ(k) divides σ(φ(k)). A66831

Numbers n such that σ(φ(n))/σ(n) = 3. A67383

T(n,k)=Number of (n+2)X(k+2) 0..4 arrays with every 3X3 subblock row and column sum nonprime and every diagonal and antidiagonal sum prime. A252039

Conjecturally, number of infinitely-recurring prime patterns on n consecutive integers. A23192

Numbers which are the sum of two positive cubes and divisible by 29. A224483

BIK(b)-b where b is A035082. A35084

Semiprimes that are the sum of two positive cubes. Common terms of A003325 and A046315. A85366