Number 691 is an integer that follows 690 and precedes 692. It is an odd number and can be expressed as the sum of two prime numbers, specifically 683 and 8. In mathematics, it is classified as a composite number because it has divisors other than 1 and itself. In terms of its properties, 691 can be factored into 7 and 99, indicating that it can be divided evenly by these numbers. Additionally, in the context of numerology, the number 691 may hold significance for those who study the meanings of numbers in various cultures and belief systems.