2701

2701 = 37 x 73.

2701 is a semiprime (a product of two primes) whose prime factors, 37 and 73, are reversals of each other.

2701 is the 73rd triangular number.

2701 is the smallest number n that divides the average of the nth prime and the primes on either side of it.

2701 has two representations as a sum of two squares: 2701 = 10² + 51² = 26² + 45².

2701 is the hypotenuse of two primitive Pythagorean triples: 27 01² = 1020² + 2501² = 1349² + 2340².

Source: Prime Curios!