2291191 has 24 divisors (see below), whose sum is σ = 2954880. Its totient is φ = 1762992.

The previous prime is 2291189. The next prime is 2291197. The reversal of 2291191 is 1911922.

It is not a de Polignac number, because 2291191 - 2¹ = 2291189 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2291197) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21360 + ... + 21466.

It is an arithmetic number, because the mean of its divisors is an integer number (123120).

2^2291191 is an apocalyptic number.

2291191 is a deficient number, since it is larger than the sum of its proper divisors (663689).

2291191 is a wasteful number, since it uses less digits than its factorization.

2291191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163 (or 156 counting only the distinct ones).

The product of its digits is 324, while the sum is 25.

The square root of 2291191 is about 1513.6680613662. The cubic root of 2291191 is about 131.8318757942.

The spelling of 2291191 in words is "two million, two hundred ninety-one thousand, one hundred ninety-one".