9897538641 has 8 divisors (see below), whose sum is σ = 13770488640. Its totient is φ = 6311473872.

The previous prime is 9897538639. The next prime is 9897538709. The reversal of 9897538641 is 1468357989.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9897538641 - 2¹ = 9897538639 is a prime.

It is a super-2 number, since 2×9897538641² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9897538241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71721226 + ... + 71721363.

It is an arithmetic number, because the mean of its divisors is an integer number (1721311080).

Almost surely, 2^9897538641 is an apocalyptic number.

It is an amenable number.

9897538641 is a deficient number, since it is larger than the sum of its proper divisors (3872949999).

9897538641 is a wasteful number, since it uses less digits than its factorization.

9897538641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143442615.

The product of its digits is 13063680, while the sum is 60.

The square root of 9897538641 is about 99486.3741474178. The cubic root of 9897538641 is about 2147.0512047126.

The spelling of 9897538641 in words is "nine billion, eight hundred ninety-seven million, five hundred thirty-eight thousand, six hundred forty-one".