Properties of the Number -999999999

Nine Hundred Ninety-Nine Million Nine Hundred Ninety-Nine Thousand Nine Hundred Ninety-Nine

Basics

Value: -1000000000 → -999999999 → -999999998

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 81

Digital Root: 9

Palindrome: Yes

Factorization: 3 ⁴ × 37 × 333667

Divisors: 1, 3, 9, 27, 37, 81, 111, 333, 999, 2997

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -111011100110101100100111111111

Octal: -7346544777

Duodecimal: -23AA93853

Hexadecimal: -3b9ac9ff

Square: 999999998000000001

Square Root: 31622.776585872405

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

a(n) = 1 - n⁹. A24007

a(n) = (-10)ⁿ + 1 - 0ⁿ. A103461

a(n) = 10ⁿ - 1. A2283

Concatenate n n times. A461

Largest number whose 4th power has n digits. A114322

Largest number whose cube has n digits. A61439

Divisors of 999999999. A27889

a(n) = (n+1)ⁿ - 1. A37205

n times (n 1's): a(n) = n*(10ⁿ - 1)/9. A53422

Replace each 1 in decimal expansion of n with 1 1's, each 2 with 2 2's, etc. (0 vanishes). A48376