2018191 has 4 divisors (see below), whose sum is σ = 2306512. Its totient is φ = 1729872.

The previous prime is 2018183. The next prime is 2018249. The reversal of 2018191 is 1918102.

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 2018191 - 2³ = 2018183 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 (2018111) 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, 144150 + ... + 144163.

It is an arithmetic number, because the mean of its divisors is an integer number (576628).

2^2018191 is an apocalyptic number.

2018191 is a deficient number, since it is larger than the sum of its proper divisors (288321).

2018191 is an equidigital number, since it uses as much as digits as its factorization.

2018191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288320.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 2018191 is about 1420.6304938301. The cubic root of 2018191 is about 126.3729397488.

It can be divided in two parts, 2018 and 191, that added together give a square (2209 = 47²).

The spelling of 2018191 in words is "two million, eighteen thousand, one hundred ninety-one".