9597991 has 8 divisors (see below), whose sum is σ = 10400544. Its totient is φ = 8804640.

The previous prime is 9597971. The next prime is 9597997. The reversal of 9597991 is 1997959.

9597991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 9597991 - 2⁹ = 9597479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9597997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40 + ... + 4381.

It is an arithmetic number, because the mean of its divisors is an integer number (1300068).

Almost surely, 2^9597991 is an apocalyptic number.

9597991 is a deficient number, since it is larger than the sum of its proper divisors (802553).

9597991 is a wasteful number, since it uses less digits than its factorization.

9597991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4601.

The product of its digits is 229635, while the sum is 49.

The square root of 9597991 is about 3098.0624590218. The cubic root of 9597991 is about 212.5168872393.

The spelling of 9597991 in words is "nine million, five hundred ninety-seven thousand, nine hundred ninety-one".