9920591 has 4 divisors (see below), whose sum is σ = 9933000. Its totient is φ = 9908184.

The previous prime is 9920579. The next prime is 9920597. The reversal of 9920591 is 1950299.

9920591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9920591 - 2¹⁴ = 9904207 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 (9920597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4916 + ... + 6633.

It is an arithmetic number, because the mean of its divisors is an integer number (2483250).

Almost surely, 2^9920591 is an apocalyptic number.

9920591 is a deficient number, since it is larger than the sum of its proper divisors (12409).

9920591 is a wasteful number, since it uses less digits than its factorization.

9920591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12408.

The product of its (nonzero) digits is 7290, while the sum is 35.

The square root of 9920591 is about 3149.6969695512. The cubic root of 9920591 is about 214.8716811373.

The spelling of 9920591 in words is "nine million, nine hundred twenty thousand, five hundred ninety-one".