9618921 has 24 divisors (see below), whose sum is σ = 15753920. Its totient is φ = 5606496.

The previous prime is 9618893. The next prime is 9618941. The reversal of 9618921 is 1298169.

9618921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9618921 - 2¹⁰ = 9617897 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (9618941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60 + ... + 4386.

Almost surely, 2^9618921 is an apocalyptic number.

It is an amenable number.

9618921 is a deficient number, since it is larger than the sum of its proper divisors (6134999).

9618921 is a wasteful number, since it uses less digits than its factorization.

9618921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4365 (or 4362 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 9618921 is about 3101.4385371953. The cubic root of 9618921 is about 212.6712511118.

The spelling of 9618921 in words is "nine million, six hundred eighteen thousand, nine hundred twenty-one".