9897447825 has 36 divisors (see below), whose sum is σ = 17735812380. Its totient is φ = 5276142720.

The previous prime is 9897447811. The next prime is 9897447863. The reversal of 9897447825 is 5287447989.

9897447825 is a `hidden beast` number, since 98 + 9 + 74 + 478 + 2 + 5 = 666.

9897447825 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 6 ways, for example, as 1571250321 + 8326197504 = 39639^2 + 91248^2 .

It is not a de Polignac number, because 9897447825 - 2¹⁹ = 9896923537 is a prime.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 528319 + ... + 546731.

It is an arithmetic number, because the mean of its divisors is an integer number (492661455).

Almost surely, 2^9897447825 is an apocalyptic number.

It is an amenable number.

9897447825 is a deficient number, since it is larger than the sum of its proper divisors (7838364555).

9897447825 is a wasteful number, since it uses less digits than its factorization.

9897447825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20818 (or 20810 counting only the distinct ones).

The product of its digits is 40642560, while the sum is 63.

The square root of 9897447825 is about 99485.9177220575. The cubic root of 9897447825 is about 2147.0446378544.

The spelling of 9897447825 in words is "nine billion, eight hundred ninety-seven million, four hundred forty-seven thousand, eight hundred twenty-five".