8847471721 has 27 divisors (see below), whose sum is σ = 10351189303. Its totient is φ = 7554979520.

The previous prime is 8847471719. The next prime is 8847471749. The reversal of 8847471721 is 1271747488.

It is a happy number.

The square root of 8847471721 is 94061.

It is a perfect power (a square), and thus also a powerful number.

8847471721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 6888170025 + 1959301696 = 82995^2 + 44264^2 .

It is not a de Polignac number, because 8847471721 - 2¹ = 8847471719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8847471701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 17589156 + ... + 17589658.

Almost surely, 2^8847471721 is an apocalyptic number.

8847471721 is the 94061-st square number.

8847471721 is the 47031-st centered octagonal number.

It is an amenable number.

8847471721 is a deficient number, since it is larger than the sum of its proper divisors (1503717582).

8847471721 is an equidigital number, since it uses as much as digits as its factorization.

8847471721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062 (or 531 counting only the distinct ones).

The product of its digits is 702464, while the sum is 49.

The cubic root of 8847471721 is about 2068.2660081086.

Multiplying 8847471721 by its sum of digits (49), we get a square (433526114329 = 658427²).

The spelling of 8847471721 in words is "eight billion, eight hundred forty-seven million, four hundred seventy-one thousand, seven hundred twenty-one".