1. The pinyin of character 7 is [qī].

2. It is an Arabic numeral, a green natural number between 6 and 8, the fourth prime number, and one of the odd numbers. 7 is equivalent to the Chinese word seven or seven. 7 is a green number. In number theory 7 is the Heegner number. The English equivalent of 7 is seven.

3.

Extended information:

Interesting knowledge about 7: Among the natural numbers, 7 is the most special and interesting number. is a prime number. In life, 7 is used very widely.

Life.

There are 7 days in a week, there are 7 beads in each row of the abacus, there are 7 colors in the spectrum, and there are 7 changeable 7-piece puzzles.

Ordinary blocky objects break into 7 large pieces after being broken. If you don’t believe it, you can pay careful attention to the details in life. The reason is unknown.

There are 7 continents on the earth.

Culture and art.

An octave diatonic scale, a guqin with 7 strings, a 7-character quatrain poem, and the legendary 7 fairies.

Mathematics.

Scientists believe that 7 is the most special number. They also found that in calculations, 7 is divided by 1, 2, 3, 4, 5, and 6. They are all infinitely recurring decimals.