9081391 has 16 divisors (see below), whose sum is σ = 10391328. Its totient is φ = 7862400.

The previous prime is 9081353. The next prime is 9081409. The reversal of 9081391 is 1931809.

It is a cyclic number.

It is not a de Polignac number, because 9081391 - 2¹³ = 9073199 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 (9081311) 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 15 ways as a sum of consecutive naturals, for example, 21361 + ... + 21781.

It is an arithmetic number, because the mean of its divisors is an integer number (649458).

Almost surely, 2^9081391 is an apocalyptic number.

9081391 is a deficient number, since it is larger than the sum of its proper divisors (1309937).

9081391 is a wasteful number, since it uses less digits than its factorization.

9081391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 9081391 is about 3013.5346356065. The cubic root of 9081391 is about 208.6335389687.

The spelling of 9081391 in words is "nine million, eighty-one thousand, three hundred ninety-one".