Properties of the Number -1111111

One Hundred Eleven Thousand One Hundred Eleven

Basics

Value: -1111112 → -1111111 → -1111110

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 7

Digital Root: 7

Palindrome: Yes

Factorization: 239 × 4649

Divisors: 1, 239, 4649, 1111111

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -100001111010001000111

Octal: -4172107

Duodecimal: -457007

Hexadecimal: -10f447

Square: 1234567654321

Square Root: 1054.0925006848308

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

Inverse of number triangle A(n,k) = 1/((10·10ⁿ-1)/9) if k <= n <= 2k, 0 otherwise. A127805

Repunits: (10ⁿ - 1)/9. Often denoted by R_n. A2275

Unary representation of natural numbers. A42

Primes written in base 2. A4676

Palindromes only using 0 and 1 (i.e., base-2 palindromes). A57148

1 repeated prime(n) times. A31974

a(n)*n = A112904(n). A112905

Triangle of Gaussian binomial coefficients [ n,k ] for q = 10. A22174

a(n) = 1111111 in base n. A53716

The sequence S = a(1), a(2), ... is defined by a(1)=1, if d,e,f are consecutive digits then we do not have d >= e < f, and S is always extended with the smallest integer not yet present in S. A239090