218353913 has 2 divisors, whose sum is σ = 218353914. Its totient is φ = 218353912.

The previous prime is 218353879. The next prime is 218353921. The reversal of 218353913 is 319353812.

It is a happy number.

218353913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209757289 + 8596624 = 14483^2 + 2932^2 .

It is a cyclic number.

It is not a de Polignac number, because 218353913 - 2⁸ = 218353657 is a prime.

It is not a weakly prime, because it can be changed into another prime (218353943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109176956 + 109176957.

It is an arithmetic number, because the mean of its divisors is an integer number (109176957).

Almost surely, 2^218353913 is an apocalyptic number.

It is an amenable number.

218353913 is a deficient number, since it is larger than the sum of its proper divisors (1).

218353913 is an equidigital number, since it uses as much as digits as its factorization.

218353913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 35.

The square root of 218353913 is about 14776.8032063772. The cubic root of 218353913 is about 602.1716792726.

The spelling of 218353913 in words is "two hundred eighteen million, three hundred fifty-three thousand, nine hundred thirteen".