218244491 has 2 divisors, whose sum is σ = 218244492. Its totient is φ = 218244490.

The previous prime is 218244443. The next prime is 218244503. The reversal of 218244491 is 194442812.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 218244491 - 2¹⁴ = 218228107 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (218244791) 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, 109122245 + 109122246.

It is an arithmetic number, because the mean of its divisors is an integer number (109122246).

Almost surely, 2^218244491 is an apocalyptic number.

218244491 is a deficient number, since it is larger than the sum of its proper divisors (1).

218244491 is an equidigital number, since it uses as much as digits as its factorization.

218244491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 35.

The square root of 218244491 is about 14773.1002501168. The cubic root of 218244491 is about 602.0710752607.

The spelling of 218244491 in words is "two hundred eighteen million, two hundred forty-four thousand, four hundred ninety-one".