9645621 has 4 divisors (see below), whose sum is σ = 12860832. Its totient is φ = 6430412.

The previous prime is 9645611. The next prime is 9645637. The reversal of 9645621 is 1265469.

9645621 is digitally balanced in base 2 and base 4, because in such bases 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 not a de Polignac number, because 9645621 - 2⁵ = 9645589 is a prime.

9645621 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9645611) 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, 1607601 + ... + 1607606.

It is an arithmetic number, because the mean of its divisors is an integer number (3215208).

Almost surely, 2^9645621 is an apocalyptic number.

It is an amenable number.

9645621 is a deficient number, since it is larger than the sum of its proper divisors (3215211).

9645621 is a wasteful number, since it uses less digits than its factorization.

9645621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3215210.

The product of its digits is 12960, while the sum is 33.

The square root of 9645621 is about 3105.7400084360. The cubic root of 9645621 is about 212.8678454619.

The spelling of 9645621 in words is "nine million, six hundred forty-five thousand, six hundred twenty-one".