9359638921 has 4 divisors (see below), whose sum is σ = 9363972244. Its totient is φ = 9355305600.

The previous prime is 9359638913. The next prime is 9359638973. The reversal of 9359638921 is 1298369539.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1298369539 = 7177 ⋅180907.

It can be written as a sum of positive squares in 2 ways, for example, as 8187535225 + 1172103696 = 90485^2 + 34236^2 .

It is a cyclic number.

It is not a de Polignac number, because 9359638921 - 2³ = 9359638913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9359638121) 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, 2163420 + ... + 2167741.

It is an arithmetic number, because the mean of its divisors is an integer number (2340993061).

Almost surely, 2^9359638921 is an apocalyptic number.

It is an amenable number.

9359638921 is a deficient number, since it is larger than the sum of its proper divisors (4333323).

9359638921 is a wasteful number, since it uses less digits than its factorization.

9359638921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4333322.

The product of its digits is 3149280, while the sum is 55.

The square root of 9359638921 is about 96745.2268641714. The cubic root of 9359638921 is about 2107.4293860569.

The spelling of 9359638921 in words is "nine billion, three hundred fifty-nine million, six hundred thirty-eight thousand, nine hundred twenty-one".