218358949 has 2 divisors, whose sum is σ = 218358950. Its totient is φ = 218358948.

The previous prime is 218358929. The next prime is 218358953. The reversal of 218358949 is 949853812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137898049 + 80460900 = 11743^2 + 8970^2 .

It is a cyclic number.

It is not a de Polignac number, because 218358949 - 2⁷ = 218358821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218358929) 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, 109179474 + 109179475.

It is an arithmetic number, because the mean of its divisors is an integer number (109179475).

Almost surely, 2^218358949 is an apocalyptic number.

It is an amenable number.

218358949 is a deficient number, since it is larger than the sum of its proper divisors (1).

218358949 is an equidigital number, since it uses as much as digits as its factorization.

218358949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 49.

The square root of 218358949 is about 14776.9736076099. The cubic root of 218358949 is about 602.1763086275.

The spelling of 218358949 in words is "two hundred eighteen million, three hundred fifty-eight thousand, nine hundred forty-nine".