8721548225 has 12 divisors (see below), whose sum is σ = 11646621756. Its totient is φ = 6440527680.

The previous prime is 8721548221. The next prime is 8721548299. The reversal of 8721548225 is 5228451278.

It can be written as a sum of positive squares in 6 ways, for example, as 1610336641 + 7111211584 = 40129^2 + 84328^2 .

It is not a de Polignac number, because 8721548225 - 2² = 8721548221 is a prime.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8721548221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13417442 + ... + 13418091.

It is an arithmetic number, because the mean of its divisors is an integer number (970551813).

Almost surely, 2^8721548225 is an apocalyptic number.

It is an amenable number.

8721548225 is a deficient number, since it is larger than the sum of its proper divisors (2925073531).

8721548225 is a wasteful number, since it uses less digits than its factorization.

8721548225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26835556 (or 26835551 counting only the distinct ones).

The product of its digits is 358400, while the sum is 44.

The square root of 8721548225 is about 93389.2297055715. The cubic root of 8721548225 is about 2058.4067412321.

The spelling of 8721548225 in words is "eight billion, seven hundred twenty-one million, five hundred forty-eight thousand, two hundred twenty-five".