218479249 has 2 divisors, whose sum is σ = 218479250. Its totient is φ = 218479248.

The previous prime is 218479241. The next prime is 218479267. The reversal of 218479249 is 942974812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157326849 + 61152400 = 12543^2 + 7820^2 .

It is a cyclic number.

It is not a de Polignac number, because 218479249 - 2³ = 218479241 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 218479199 and 218479208.

It is not a weakly prime, because it can be changed into another prime (218479241) 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, 109239624 + 109239625.

It is an arithmetic number, because the mean of its divisors is an integer number (109239625).

Almost surely, 2^218479249 is an apocalyptic number.

It is an amenable number.

218479249 is a deficient number, since it is larger than the sum of its proper divisors (1).

218479249 is an equidigital number, since it uses as much as digits as its factorization.

218479249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 46.

The square root of 218479249 is about 14781.0435693830. The cubic root of 218479249 is about 602.2868735344.

The spelling of 218479249 in words is "two hundred eighteen million, four hundred seventy-nine thousand, two hundred forty-nine".