If the diameter of the sun is 1,391,000,000 meters, then if it were a 1-meter sphere the diameter would be 7.2 × 10⁻¹⁰
As for the other planets, the original diameters of each planet should be multiplied by the new diameter of the sun, which leads to:
Mercury: 0.0035 meters
Venus: 0.0087 meters
Earth: 0.0092 meters
Mars: 0.0049 meters
Jupiter: 0.1028 meters
Saturn: 0.086 meters
Uranus: 0.0367 meters
Neptune: 0.0356 meters