59999999

59999999 is the eight-digit natural number used in decimal notation. It equals 60,000,000 minus 1, and its decimal representation consists of a leading 5 followed by seven 9s. The number is odd and is not divisible by 2 or 5. Its digit sum is 68, giving a digital root of 5, so it is congruent to 5 modulo 9. It lies between 59,000,000 and 60,000,000. In base-10, it is one less than a round decimal total, which can make it a convenient boundary value in some computational tests.

In mathematics and computer science, 59999999 is sometimes used as a boundary case or test value because it is close to a round threshold but not itself round. It can be useful for examining off-by-one behavior, overflow handling, or formatting logic in software and datasets that manage large integers. Beyond such practical uses, there is no widely recognized special property or widely cited significance of this specific integer in standard mathematical theory.

The full prime factorization of 59999999 is not implied by these notes and is generally left to computational factorization. For quick checks, it is not divisible by several small primes such as 2, 3, 5, 7, 11, 13, 17, 19, or 29.