All those born on 4, 13, 22 or 31 of any month come under numerology 4 and are dominated by number 4. The number four is all things dependable and stable. It is very sensible, rational, and leads all other numbers in practicality. All other numbers lean on number four as a force of stabilization. This number does all things with efficiency and thoroughness. It is associated with a nature of doing the same things repetitively, consistently.

Look how the number is shaped: 4. It is designed to give the idea of having feet on the ground at all times. It is connected to the natural element of earth, which again represents feet on the ground. This is a number of rational thought and expected behavior. This is not a number to forge new pathways. It sticks with what is known and well worn. Just like all the yin numbers 4 is conservative.
The characteristics of numerology 4 will be same as described in this page-

General Characteristics– The numerology four persons are basically very moody. When their mood is upset, it takes them a long time to recover. They work for long hours but get little appreciation. Women born on these dates will work hard at home and will take the responsibility of whole family. They are trustworthy and earn a good reputation in society.

Strength– Systematic, efficient, calm, determined, responsible, honest, faithful, work minded, active, helpful, and devoted to others welfare.

Weakness– Lack of imagination, stubbornness, non co-operative, argumentative, over seriousness.

Opportunity– Success in business, sometimes unexpected success.

Threat– Undue control or influence by others, name and fame may be in peril, loss of reputation leads to depression.

Health – Weak respiratory system may cause breathing problems. severe pain in knees and feet. Sudden stomach pain may affect them often.

Finance– Development comes after the age of 40.They may experience many ups and downs in financial maters. They will be successful while working alone.

Compatible numbers for relation– Number 2, Number 4 and Number 8.

Attractive numbers– 1, 2, 8.

Repulsive numbers– 3,5.

Influenced by– Number 4 persons are influenced by Uranus.

Development comes in the year– 2, 4, 8, 11, 13, 17, 20, 22, 26, 29, 31, 35, 38, 40, 44, 47, 49, 53, 56, 58, 62.

Lucky numbers– 1, 2, 4, 5, 6.

Unlucky numbers-3, 7, 8, 9.

Lucky color– Brown, dark orange.

Gem– Hessonite Garnet.