133138

133,138 is a natural number that lies between 133,137 and 133,139 in the sequence of integers. In decimal notation it is even and composite. Its prime factorization is 2 × 66,569, and since 66,569 is a prime number, 133,138 is a semiprime (the product of two primes).

In terms of basic digit properties, the sum of its digits is 19, giving a digital root of 1. The digits are 1, 3, 3, 1, 3, 8, which include three occurrences of the digit 3. Because the number is even, it is divisible by 2, but it is not divisible by 3 or 5. Its last digit being 8 confirms divisibility by 2, while the last two or three digits do not indicate divisibility by higher powers of 2.

Beyond these arithmetic characteristics, 133,138 does not have widely noted significance in mathematics or culture and is mainly encountered as an example of a semiprime in introductory number theory discussions. It serves to illustrate the concept of prime factorization when one factor is as small as 2 and the other is relatively large.

See also:

- 133,137

- 133,139

- Semiprime

- List of prime numbers and semiprimes