Properties of the Number -642001

Six Hundred Forty-Two Thousand One

Basics

Value: -642002 → -642001 → -642000

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 401 × 1601

Divisors: 1, 401, 1601, 642001

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: -10011100101111010001

Octal: -2345721

Duodecimal: -26B641

Hexadecimal: -9cbd1

Square: 412165284001

Square Root: 801.2496489858826

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

Strings giving winning positions in Tchoukaillon (or Mancala) solitaire. A28931

Fermat pseudoprimes to base 2 that are decagonal. A321870

Intersection of A001567 and A212502. A212601

Poulet numbers (2-pseudoprimes) of the form 144·n² + 222·n + 85. A214017

Smith numbers which are also base-2 pseudoprimes. A63844

Composite numbers k such that k divides Fibonacci(k+1) or Fibonacci(k-1) and 2^k-1 == 1 (mod k). A214434