18041191 has 4 divisors (see below), whose sum is σ = 20618512. Its totient is φ = 15463872.

The previous prime is 18041173. The next prime is 18041249. The reversal of 18041191 is 19114081.

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 18041191 - 2⁵ = 18041159 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 (18041791) 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, 1288650 + ... + 1288663.

It is an arithmetic number, because the mean of its divisors is an integer number (5154628).

Almost surely, 2^18041191 is an apocalyptic number.

18041191 is a deficient number, since it is larger than the sum of its proper divisors (2577321).

18041191 is an equidigital number, since it uses as much as digits as its factorization.

18041191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2577320.

The product of its (nonzero) digits is 288, while the sum is 25.

The square root of 18041191 is about 4247.4923190042. The cubic root of 18041191 is about 262.2738963074.

The spelling of 18041191 in words is "eighteen million, forty-one thousand, one hundred ninety-one".