9691 has 4 divisors (see below), whose sum is σ = 10584. Its totient is φ = 8800.

The previous prime is 9689. The next prime is 9697. The reversal of 9691 is 1969.

9691 = T₁₈ + T₁₉ + ... + T₃₉.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1969 = 11 ⋅179.

It is not a de Polignac number, because 9691 - 2¹ = 9689 is a prime.

It is a Duffinian number.

9691 is a lucky number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (9697) 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, 430 + ... + 451.

It is an arithmetic number, because the mean of its divisors is an integer number (2646).

2⁹⁶⁹¹ is an apocalyptic number.

9691 is a deficient number, since it is larger than the sum of its proper divisors (893).

9691 is a wasteful number, since it uses less digits than its factorization.

9691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892.

The product of its digits is 486, while the sum is 25.

The square root of 9691 is about 98.4428768373. The cubic root of 9691 is about 21.3201144236.

The spelling of 9691 in words is "nine thousand, six hundred ninety-one".