8792351721 has 12 divisors (see below), whose sum is σ = 12755525380. Its totient is φ = 5835970080.

The previous prime is 8792351717. The next prime is 8792351761. The reversal of 8792351721 is 1271532978.

It can be written as a sum of positive squares in 2 ways, for example, as 7932396096 + 859955625 = 89064^2 + 29325^2 .

It is not a de Polignac number, because 8792351721 - 2² = 8792351717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8792351761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2130970 + ... + 2135091.

Almost surely, 2^8792351721 is an apocalyptic number.

It is an amenable number.

8792351721 is a deficient number, since it is larger than the sum of its proper divisors (3963173659).

8792351721 is a wasteful number, since it uses less digits than its factorization.

8792351721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4266296 (or 4266293 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 8792351721 is about 93767.5408710285. The cubic root of 8792351721 is about 2063.9619388882.

The spelling of 8792351721 in words is "eight billion, seven hundred ninety-two million, three hundred fifty-one thousand, seven hundred twenty-one".