9897591 has 16 divisors (see below), whose sum is σ = 14670720. Its totient is φ = 5884320.

The previous prime is 9897581. The next prime is 9897599. The reversal of 9897591 is 1957989.

9897591 is nontrivially palindromic in base 12.

It is not a de Polignac number, because 9897591 - 2¹⁵ = 9864823 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9897591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9897599) 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 15 ways as a sum of consecutive naturals, for example, 1081 + ... + 4578.

It is an arithmetic number, because the mean of its divisors is an integer number (916920).

Almost surely, 2^9897591 is an apocalyptic number.

9897591 is a deficient number, since it is larger than the sum of its proper divisors (4773129).

9897591 is a wasteful number, since it uses less digits than its factorization.

9897591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5726.

The product of its digits is 204120, while the sum is 48.

The square root of 9897591 is about 3146.0437059901. The cubic root of 9897591 is about 214.7054990747.

The spelling of 9897591 in words is "nine million, eight hundred ninety-seven thousand, five hundred ninety-one".