CREATE TABLE table_name_17 (inegi_code INTEGER, population_density___km_2__ VARCHAR(255), human_development_index__2000_ VARCHAR(255))
WHich INEGI code has a Population density (/km 2 ) smaller than 81.4 and 0.6593 Human Development Index (2000)?
    
SQL: SELECT AVG(inegi_code) FROM table_name_17 WHERE population_density___km_2__ < 81.4 AND human_development_index__2000_ = 0.6593