9791221980 has 48 divisors (see below), whose sum is σ = 27522139680. Its totient is φ = 2600828928.

The previous prime is 9791221861. The next prime is 9791222027. The reversal of 9791221980 is 891221979.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 302065 + ... + 332904.

It is an arithmetic number, because the mean of its divisors is an integer number (573377910).

Almost surely, 2^9791221980 is an apocalyptic number.

It is an amenable number.

9791221980 is an abundant number, since it is smaller than the sum of its proper divisors (17730917700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9791221980 is a wasteful number, since it uses less digits than its factorization.

9791221980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635238 (or 635236 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 48.

The square root of 9791221980 is about 98950.6037374204. The cubic root of 9791221980 is about 2139.3358334294.

The spelling of 9791221980 in words is "nine billion, seven hundred ninety-one million, two hundred twenty-one thousand, nine hundred eighty".