123145

123145 is a natural number that lies between 123144 and 123146. It is written in decimal notation and has six digits, ending in 5.

The number is composite and not prime. Its prime factorization is 123145 = 5 × 11 × 2239, where 2239 is itself a prime number. Because it is the product of three distinct primes, 123145 is squarefree. It is odd and divisible by 5 (as indicated by the final digit). The sum of its digits is 16, so the number is not divisible by 3, and consequently not divisible by 9. The greatest common divisor with 10 is 5.

In terms of size and classification, 123145 is not a perfect square or cube, and it is not a palindrome (the digits read 123145 forward but 541321 backward). Its digital root is 7, obtained by repeatedly summing digits until a single digit remains.

There is no widely recognized mathematical constant or theorem associated specifically with 123145. Outside of pure arithmetic, it can serve as a random six-digit identifier in examples, datasets, or catalog numbers, but it does not carry a notable, standardized meaning in mathematics.