Properties of the Number -111111111

One Hundred Eleven Million One Hundred Eleven Thousand One Hundred Eleven

Basics

Value: -111111112 → -111111111 → -111111110

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 9

Digital Root: 9

Palindrome: Yes

Factorization: 3 ² × 37 × 333667

Divisors: 1, 3, 9, 37, 111, 333, 333667, 1001001, 3003003, 12345679

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -110100111110110101111000111

Octal: -647665707

Duodecimal: -312644B3

Hexadecimal: -69f6bc7

Square: 12345678987654321

Square Root: 10540.925528624135

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

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

Unary representation of natural numbers. A42

Least positive multiple of n that when written in base 10 uses only 0's and 1's. A4290

Numbers k such that k² divides 10^k-1. A127100

a(n)*n = A112909(n). A112910

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

a(n) = (n^n-1 - 1)/(n-1) for n>1, a(1) = 0. A60072

Copies of 1 and 7 alternately such that every partial concatenation is a prime. A110776

Triangle read by rows: T(n,k) = value of the n-th repunit in base (k+1) representation, 1<=k<=n. A125118

Numbers k such that k³ divides 10^k² - 1. A177243