9606638821 has 4 divisors (see below), whose sum is σ = 10345611052. Its totient is φ = 8867666592.

The previous prime is 9606638779. The next prime is 9606638843. The reversal of 9606638821 is 1288366069.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 622253025 + 8984385796 = 24945^2 + 94786^2 .

It is a cyclic number.

It is not a de Polignac number, because 9606638821 - 2⁷ = 9606638693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9606638891) 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, 369486096 + ... + 369486121.

It is an arithmetic number, because the mean of its divisors is an integer number (2586402763).

Almost surely, 2^9606638821 is an apocalyptic number.

It is an amenable number.

9606638821 is a deficient number, since it is larger than the sum of its proper divisors (738972231).

9606638821 is a wasteful number, since it uses less digits than its factorization.

9606638821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738972230.

The product of its (nonzero) digits is 746496, while the sum is 49.

The square root of 9606638821 is about 98013.4624477679. The cubic root of 9606638821 is about 2125.8069421440.

The spelling of 9606638821 in words is "nine billion, six hundred six million, six hundred thirty-eight thousand, eight hundred twenty-one".