1853

1853= 17 x 109.

1853 is a semiprime divisible by the sum of its digits (A118693).

1853 is the sum of two positive cubes and divisible by 17 (A099178).

 1853 is a number n such that the strings n9n and 9n9 are both primes (A090265).

1853 has two representations as a sum of two squares: 1853 = 2² + 43² = 22² + 37².

1853 is the hypotenuse of two primitive Pythagorean triples: 1853² = 172² + 1845² = 885² + 1628².

1853 divides 33⁴ - 1.

Source: OEIS