9728591 has 2 divisors, whose sum is σ = 9728592. Its totient is φ = 9728590.

The previous prime is 9728567. The next prime is 9728597. The reversal of 9728591 is 1958279.

9728591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9728591 - 2⁶ = 9728527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9728597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4864295 + 4864296.

It is an arithmetic number, because the mean of its divisors is an integer number (4864296).

Almost surely, 2^9728591 is an apocalyptic number.

9728591 is a deficient number, since it is larger than the sum of its proper divisors (1).

9728591 is an equidigital number, since it uses as much as digits as its factorization.

9728591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 41.

The square root of 9728591 is about 3119.0689315884. The cubic root of 9728591 is about 213.4764547964.

The spelling of 9728591 in words is "nine million, seven hundred twenty-eight thousand, five hundred ninety-one".