9659 has 4 divisors (see below), whose sum is σ = 10416. Its totient is φ = 8904.

The previous prime is 9649. The next prime is 9661. The reversal of 9659 is 9569.

9659 = 21² + 22² + ... + 33².

9659 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9569 = 7 ⋅1367.

It is a cyclic number.

It is not a de Polignac number, because 9659 - 2⁴ = 9643 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15 and base 16.

It is not an unprimeable number, because it can be changed into a prime (9619) 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, 359 + ... + 384.

It is an arithmetic number, because the mean of its divisors is an integer number (2604).

2⁹⁶⁵⁹ is an apocalyptic number.

9659 is a deficient number, since it is larger than the sum of its proper divisors (757).

9659 is a wasteful number, since it uses less digits than its factorization.

9659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756.

The product of its digits is 2430, while the sum is 29.

The square root of 9659 is about 98.2802116400. The cubic root of 9659 is about 21.2966219745.

The spelling of 9659 in words is "nine thousand, six hundred fifty-nine".