Do you have an idea about the relation between sumerian god and number nine?

No, there is no connection, nor is there any evidence of the Sumerian civilisations knowledge of nine planets, often portrayed in books by authors such as that of Zecharia Sitchin, a pseudo-Assyriologist. Between the Sumerians and later Babylonians, only five planets where known; Venus, Mercury, Mars, Jupiter, and Saturn. All observable by eye at night in the right conditions.