18882191 has 2 divisors, whose sum is σ = 18882192. Its totient is φ = 18882190.

The previous prime is 18882169. The next prime is 18882197. The reversal of 18882191 is 19128881.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (19128881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18882191 - 2¹⁰ = 18881167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18882197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9441095 + 9441096.

It is an arithmetic number, because the mean of its divisors is an integer number (9441096).

Almost surely, 2^18882191 is an apocalyptic number.

18882191 is a deficient number, since it is larger than the sum of its proper divisors (1).

18882191 is an equidigital number, since it uses as much as digits as its factorization.

18882191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 38.

The square root of 18882191 is about 4345.3643115394. The cubic root of 18882191 is about 266.2875092445.

The spelling of 18882191 in words is "eighteen million, eight hundred eighty-two thousand, one hundred ninety-one".