8691 has 4 divisors (see below), whose sum is σ = 11592. Its totient is φ = 5792.

The previous prime is 8689. The next prime is 8693. The reversal of 8691 is 1968.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (8689) and next prime (8693).

It is a cyclic number.

It is not a de Polignac number, because 8691 - 2¹ = 8689 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (8693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1446 + ... + 1451.

It is an arithmetic number, because the mean of its divisors is an integer number (2898).

2⁸⁶⁹¹ is an apocalyptic number.

8691 is a deficient number, since it is larger than the sum of its proper divisors (2901).

8691 is a wasteful number, since it uses less digits than its factorization.

8691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2900.

The product of its digits is 432, while the sum is 24.

The square root of 8691 is about 93.2255329832. The cubic root of 8691 is about 20.5600066113.

The spelling of 8691 in words is "eight thousand, six hundred ninety-one".