Properties of the Number 1209

One Thousand Two Hundred Nine

Basics

Value: 1208 → 1209 → 1210

Parity: odd

Prime: No

Previous Prime: 1201

Next Prime: 1213

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 13 × 31

Divisors: 1, 3, 13, 31, 39, 93, 403, 1209

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10010111001

Octal: 2271

Duodecimal: 849

Hexadecimal: 4b9

Square: 1461681

Square Root: 34.77067730142742

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

Number of rucksack partitions of n: every consecutive constant subsequence has a different sum. A353864

Number of integer partitions of n containing three parts (a,b,c) (repeats allowed) such that a + b = c. A variation of sum-full partitions. A363225

Number of partitions of n with a product greater than n. A114324

|First digit - second digit + third digit - fourth digit ...| = 10. A60978

a(n) = n*(n+8). A28566

a(n)=T(n,n), array T as in A049687. Also a(n)=T(2n,2n), array T given by A049639. A49691

Numerator of 1/16 - 1/n². A61041

a(n) = n*(5·n² - 2)/3. A4466

Number of integer partitions of 2n with reverse-alternating sum -2. A344741

Numbers that are the sum of 3 nonzero squares in 10 or more ways. A25338