218552849 has 2 divisors, whose sum is σ = 218552850. Its totient is φ = 218552848.

The previous prime is 218552827. The next prime is 218552869. The reversal of 218552849 is 948255812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119749249 + 98803600 = 10943^2 + 9940^2 .

It is a cyclic number.

It is not a de Polignac number, because 218552849 - 2²⁴ = 201775633 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (218552819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109276424 + 109276425.

It is an arithmetic number, because the mean of its divisors is an integer number (109276425).

Almost surely, 2^218552849 is an apocalyptic number.

It is an amenable number.

218552849 is a deficient number, since it is larger than the sum of its proper divisors (1).

218552849 is an equidigital number, since it uses as much as digits as its factorization.

218552849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 230400, while the sum is 44.

The square root of 218552849 is about 14783.5330351036. The cubic root of 218552849 is about 602.3544975572.

The spelling of 218552849 in words is "two hundred eighteen million, five hundred fifty-two thousand, eight hundred forty-nine".