Properties of the Number 1643

One Thousand Six Hundred Forty-Three

Basics

Value: 1642 → 1643 → 1644

Parity: odd

Prime: No

Previous Prime: 1637

Next Prime: 1657

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 31 × 53

Divisors: 1, 31, 53, 1643

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11001101011

Octal: 3153

Duodecimal: B4B

Hexadecimal: 66b

Square: 2699449

Square Root: 40.53393639902249

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 integer partitions of n with distinct differences between successive parts. A325325

Numbers n such that n divides the (left) concatenation of all numbers <= n written in base 2 (most significant digit on right). A61955

Numbers whose sum of divisors is a cube. A20477

Sum of first n composite numbers. A53767

Number of partitions of n in which each part, with the possible exception of the largest, occurs at least twice. A116931

a(n) = n² + n + 3. A27688

Composite and every divisor (except 1) contains the digit 3. A62668

a(n) = n*(3·n + 13)/2. A140672

Odd semiprimes p·q with p < q < 2·p. A82663

Numbers that are the sum of 9 consecutive primes. A127336