9651 has 4 divisors (see below), whose sum is σ = 12872. Its totient is φ = 6432.

The previous prime is 9649. The next prime is 9661. The reversal of 9651 is 1569.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1569 = 3 ⋅523.

It is not a de Polignac number, because 9651 - 2¹ = 9649 is a prime.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (9601) 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, 1606 + ... + 1611.

It is an arithmetic number, because the mean of its divisors is an integer number (3218).

2⁹⁶⁵¹ is an apocalyptic number.

9651 is a deficient number, since it is larger than the sum of its proper divisors (3221).

9651 is a wasteful number, since it uses less digits than its factorization.

9651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3220.

The product of its digits is 270, while the sum is 21.

The square root of 9651 is about 98.2395032561. The cubic root of 9651 is about 21.2907407572.

The spelling of 9651 in words is "nine thousand, six hundred fifty-one".