Properties of the Number -11111111

Eleven Million One Hundred Eleven Thousand One Hundred Eleven

Basics

Value: -11111112 → -11111111 → -11111110

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 8

Digital Root: 8

Palindrome: Yes

Factorization: 11 × 73 × 101 × 137

Divisors: 1, 11, 73, 101, 137, 803, 1111, 1507, 7373, 10001

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: -101010011000101011000111

Octal: -52305307

Duodecimal: -387A05B

Hexadecimal: -a98ac7

Square: 123456787654321

Square Root: 3333.3333166666666

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

a(n) = (10^n-1-1) * (n-10) / 9. A91691

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

Unary representation of natural numbers. A42

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

Vertically symmetrical dates DDMMYYYY excluding years which are divisible by 10, considered as numbers, in increasing order. A106605

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

Vertically symmetrical dates MMDDYYYY (American notation) excluding years which are divisible by 10, considered as numbers, in increasing order. A107273

Vertically symmetrical dates YYYYMMDD (metric convention) for years >=1000, considered as numbers, in increasing order which here is also the chronological order. A107275

Numbers n with property that for each single digit d of n, we can also see the decimal expansions of d² and d³ as substrings of n. Also n may not contain any 0 digits. A135463