218849791 has 2 divisors, whose sum is σ = 218849792. Its totient is φ = 218849790.

The previous prime is 218849737. The next prime is 218849797. The reversal of 218849791 is 197948812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 218849791 - 2²³ = 210461183 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218849797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109424895 + 109424896.

It is an arithmetic number, because the mean of its divisors is an integer number (109424896).

Almost surely, 2^218849791 is an apocalyptic number.

218849791 is a deficient number, since it is larger than the sum of its proper divisors (1).

218849791 is an equidigital number, since it uses as much as digits as its factorization.

218849791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 49.

The square root of 218849791 is about 14793.5726246232. The cubic root of 218849791 is about 602.6271751651.

The spelling of 218849791 in words is "two hundred eighteen million, eight hundred forty-nine thousand, seven hundred ninety-one".