Properties of the Number 1909

One Thousand Nine Hundred Nine

Basics

Value: 1908 → 1909 → 1910

Parity: odd

Prime: No

Previous Prime: 1907

Next Prime: 1913

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 23 × 83

Divisors: 1, 23, 83, 1909

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11101110101

Octal: 3565

Duodecimal: 1131

Hexadecimal: 775

Square: 3644281

Square Root: 43.69210454990696

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

Generalized 9-gonal (or enneagonal) numbers: m*(7·m - 5)/2 with m = 0, 1, -1, 2, -2, 3, -3, ... A118277

a(n) = n·prime(n). A33286

Numbers that are the sum of 12 positive 6th powers. A3368

a(n) = n·a(n-1) + (n-5)*a(n-2). A1910

Triangle T(n, k), read by row, related to Euler's difference table A068106 (divide column k of A068106 by k!). A86764

Numbers where 9 outnumbers any other digit. A292449

Second 9-gonal (or nonagonal) numbers: a(n) = n*(7·n+5)/2. A179986

Number of integer partitions of n where the parts do not have the same median as the distinct parts. A360244

Number of distinct products ijk with 1 <= i,j,k <= n. A27425

Composite numbers > 9 which yield a prime whenever a 0 is inserted between any two digits. A216169