13579

13579 is the five-digit natural number in base-10 formed by concatenating the first five odd digits: 1, 3, 5, 7, and 9. It is an odd integer and lies in the range of five-digit numbers (between 10,000 and 19,999).

Its digit sum is 25, giving a digital root of 7. Consequently, 13579 is congruent to 7 modulo 9 and to 1 modulo 3. It is not divisible by 2, 3, or 5, and its remainder when divided by 11 is 5. In terms of factorization, 13579 = 37 × 367, so it is a composite number.

As a numeral, 13579 is notable primarily for being the concatenation of consecutive odd digits rather than for any distinct mathematical property or named sequence. It serves as a convenient example in discussions of digit sums, modular arithmetic, and basic factorization, but it does not correspond to a widely cited constant, sequence, or theorem.