218805229 has 2 divisors, whose sum is σ = 218805230. Its totient is φ = 218805228.

The previous prime is 218805143. The next prime is 218805247. The reversal of 218805229 is 922508812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210308004 + 8497225 = 14502^2 + 2915^2 .

It is a cyclic number.

It is not a de Polignac number, because 218805229 - 2²⁵ = 185250797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218805259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109402614 + 109402615.

It is an arithmetic number, because the mean of its divisors is an integer number (109402615).

Almost surely, 2^218805229 is an apocalyptic number.

It is an amenable number.

218805229 is a deficient number, since it is larger than the sum of its proper divisors (1).

218805229 is an equidigital number, since it uses as much as digits as its factorization.

218805229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 218805229 is about 14792.0664208893. The cubic root of 218805229 is about 602.5862702519.

The spelling of 218805229 in words is "two hundred eighteen million, eight hundred five thousand, two hundred twenty-nine".