218849497 has 2 divisors, whose sum is σ = 218849498. Its totient is φ = 218849496.

The previous prime is 218849479. The next prime is 218849563. The reversal of 218849497 is 794948812.

It is a happy number.

Together with previous prime (218849479) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214944921 + 3904576 = 14661^2 + 1976^2 .

It is a cyclic number.

It is not a de Polignac number, because 218849497 - 2⁷ = 218849369 is a prime.

It is not a weakly prime, because it can be changed into another prime (218849297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109424748 + 109424749.

It is an arithmetic number, because the mean of its divisors is an integer number (109424749).

Almost surely, 2^218849497 is an apocalyptic number.

It is an amenable number.

218849497 is a deficient number, since it is larger than the sum of its proper divisors (1).

218849497 is an equidigital number, since it uses as much as digits as its factorization.

218849497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 52.

The square root of 218849497 is about 14793.5626878720. The cubic root of 218849497 is about 602.6269053111.

The spelling of 218849497 in words is "two hundred eighteen million, eight hundred forty-nine thousand, four hundred ninety-seven".