11111

11111 is a five-digit number in base-10, consisting of five consecutive ones. It is the decimal representation of the fifth repunit, denoted R5, and equals (10^5 - 1)/9 = 10000 + 1000 + 100 + 10 + 1 = 11111.

Mathematically, 11111 is a composite number. Its prime factorization is 41 × 271, so its divisors are 1, 41, 271, and 11111. The number is a palindrome, since its digits read the same forwards and backwards.

As a repunit, 11111 belongs to the family R_n = (10^n - 1)/9. Repunits have the property that R_m divides R_n whenever m divides n. In this sense, 11111 is part of a larger sequence with known divisibility relations.

In bases other than ten, a five-digit repunit is represented by the value (b^5 - 1)/(b - 1). For example, interpreting the string of five ones in base 2 gives 31 in decimal. This illustrates how the same digit string can denote different values depending on the numeral base.