218135311 has 2 divisors, whose sum is σ = 218135312. Its totient is φ = 218135310.

The previous prime is 218135297. The next prime is 218135339. The reversal of 218135311 is 113531812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 218135311 - 2⁹ = 218134799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218135011) 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, 109067655 + 109067656.

It is an arithmetic number, because the mean of its divisors is an integer number (109067656).

Almost surely, 2^218135311 is an apocalyptic number.

218135311 is a deficient number, since it is larger than the sum of its proper divisors (1).

218135311 is an equidigital number, since it uses as much as digits as its factorization.

218135311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 25.

The square root of 218135311 is about 14769.4045580721. The cubic root of 218135311 is about 601.9706602258.

The spelling of 218135311 in words is "two hundred eighteen million, one hundred thirty-five thousand, three hundred eleven".