The total population of Indonesia is 266,794,980 people. The people of Indonesia speak the Indonesian language. The linguistic diversity of Indonesia is very diverse according to a fractionation scale, which is 0.768 for Indonesia. The average age is 29.2 years. Life expectancy in Indonesia is 71. Female fertility rate in Indonesia is 2.6. About 5% of the Indonesian population is obese. Ethnic diversity is quite diverse according to a fractionation scale, which for Indonesia is 0.7351. Details on the language, religion, age, gender distribution and rise of the Indonesian population can be found in the sections below, as well as the section on education in the country. Population In Indonesia, the population density is 135 people per square kilometer (351 per square mile). Based on these statistics, this country is considered to be densely populated. The total population of Indonesia is 266,794,980 people. Indonesia has approximately 295,433 foreign immigrants. Immigrants in Indonesia account for 0.2 percent of the total number of immigrants worldwide. Immigrants in Indonesia account for 0.1 percent of the total number of immigrants worldwide. Indonesia's ethnic diversity varies widely according to an ethnicity-based fractionation scale. Ethnic fractionation (EF) deals with the number, size, socioeconomic distribution, and geographic location of diverse cultural groups, usually within a state or other demarcated area. Specific cultural characteristics can refer to language, skin color, religion, ethnicity, customs and traditions, history, or other distinctive criteria, alone or in combination. These characteristics are often used for social exclusion and power monopolization. Index of ethnic fractionation in Indonesia is 0.7351. This means that there is a relatively high number of unique ethnic groups in Indonesia. EF is usually measured as 1 minus the Herfindahl concentration index of ethnolinguistic group proportions, which reflects the probability that two randomly drawn individuals from the population belong to different groups. The theoretical maximum of EF of 1 means that each person belongs to a different group. Below are statistics of Indonesia on average age and gender distribution at different ages. Old The average age is 29.2 years. The median age for men is 28.7 and the median age for women is 29.8. Gender The sex ratio, or number of males per female (estimated at birth), is 1.05. It can be further broken down into the following categories: sex ratio below 15 - 1.03; sex ratio from 15 to 64 - 1.01; sex ratio over 64 - 0.8; Overall sex ratio - 1. The overall sex ratio differs from the sex ratio estimated at birth. This is because some newborns are included in the sex ratio estimated at birth, but die within the first few weeks of life and are not included in the overall sex ratio. Religion The majority religion in Indonesia is Islam, whose adherents make up 87.2% of all religious believers in the country. Islam (Arabic: الإسلام) is a monotheistic and Abrahamic religion articulated through the Qur'an, a religious text believed to be the literal word of God (Allāh) by its followers and by the teachings and norms for the vast majority of followers becomes an example (called Sunnah, Arabic سنة, composed of reports, called Hadith, Arabic حديث) of Muhammad, who is considered by most of them to be the last prophet of God. A follower of Islam is called a Muslim. Besides Islam, there are several other religions in the country. Other religions in Indonesia are Islam, Hinduism. Indonesia's religious diversity is vaguely diverse according to a fractionation scale based on the number of religions in Indonesia. Index of religious fractionation in Indonesia is 0.234. This value means that within the country there is a main belief with some other sub-beliefs.