218135849 has 2 divisors, whose sum is σ = 218135850. Its totient is φ = 218135848.

The previous prime is 218135837. The next prime is 218135893. The reversal of 218135849 is 948531812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 218093824 + 42025 = 14768^2 + 205^2 .

It is a cyclic number.

It is not a de Polignac number, because 218135849 - 2⁴ = 218135833 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (218135549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109067924 + 109067925.

It is an arithmetic number, because the mean of its divisors is an integer number (109067925).

Almost surely, 2^218135849 is an apocalyptic number.

It is an amenable number.

218135849 is a deficient number, since it is larger than the sum of its proper divisors (1).

218135849 is an equidigital number, since it uses as much as digits as its factorization.

218135849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 41.

The square root of 218135849 is about 14769.4227713882. The cubic root of 218135849 is about 601.9711551173.

The spelling of 218135849 in words is "two hundred eighteen million, one hundred thirty-five thousand, eight hundred forty-nine".