9660921 has 4 divisors (see below), whose sum is σ = 12881232. Its totient is φ = 6440612.

The previous prime is 9660907. The next prime is 9660941. The reversal of 9660921 is 1290669.

It is a happy number.

9660921 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9660921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9660901) 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, 1610151 + ... + 1610156.

It is an arithmetic number, because the mean of its divisors is an integer number (3220308).

Almost surely, 2^9660921 is an apocalyptic number.

It is an amenable number.

9660921 is a deficient number, since it is larger than the sum of its proper divisors (3220311).

9660921 is a wasteful number, since it uses less digits than its factorization.

9660921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3220310.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 9660921 is about 3108.2022134990. The cubic root of 9660921 is about 212.9803371829.

The spelling of 9660921 in words is "nine million, six hundred sixty thousand, nine hundred twenty-one".