18140191 has 2 divisors, whose sum is σ = 18140192. Its totient is φ = 18140190.

The previous prime is 18140189. The next prime is 18140203. The reversal of 18140191 is 19104181.

It is a weak prime.

It is an emirp because it is prime and its reverse (19104181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18140191 - 2¹ = 18140189 is a prime.

Together with 18140189, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18140131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9070095 + 9070096.

It is an arithmetic number, because the mean of its divisors is an integer number (9070096).

Almost surely, 2^18140191 is an apocalyptic number.

18140191 is a deficient number, since it is larger than the sum of its proper divisors (1).

18140191 is an equidigital number, since it uses as much as digits as its factorization.

18140191 is an evil number, because the sum of its binary digits is even.

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

The square root of 18140191 is about 4259.1303102864. The cubic root of 18140191 is about 262.7527591121.

The spelling of 18140191 in words is "eighteen million, one hundred forty thousand, one hundred ninety-one".