9001091 has 4 divisors (see below), whose sum is σ = 9819384. Its totient is φ = 8182800.

The previous prime is 9001063. The next prime is 9001093. The reversal of 9001091 is 1901009.

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 9001091 - 2¹⁰ = 9000067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9001093) 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, 409130 + ... + 409151.

It is an arithmetic number, because the mean of its divisors is an integer number (2454846).

Almost surely, 2^9001091 is an apocalyptic number.

9001091 is a deficient number, since it is larger than the sum of its proper divisors (818293).

9001091 is a wasteful number, since it uses less digits than its factorization.

9001091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818292.

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 9001091 is about 3000.1818278231. The cubic root of 9001091 is about 208.0167870450.

It can be divided in two parts, 900 and 1091, that added together give a palindrome (1991).

The spelling of 9001091 in words is "nine million, one thousand, ninety-one".