Properties of the Number -642181

Six Hundred Forty-Two Thousand One Hundred Eighty-One

Basics

Value: -642182 → -642181 → -642180

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 19 × 73 × 463

Divisors: 1, 19, 73, 463, 1387, 8797, 33799, 642181

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -10011100110010000101

Octal: -2346205

Duodecimal: -26B771

Hexadecimal: -9cc85

Square: 412396436761

Square Root: 801.3619656559699

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

Terms of A324315 (squarefree integers m > 1 such that if prime p divides m, then the sum of the base p digits of m is at least p) that are also octagonal numbers (A000567) with index equal to their largest prime factor. A324320

Odd octagonal numbers indexed by triangular numbers. A243201