209118229 has 2 divisors, whose sum is σ = 209118230. Its totient is φ = 209118228.

The previous prime is 209118223. The next prime is 209118257. The reversal of 209118229 is 922811902.

209118229 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201583204 + 7535025 = 14198^2 + 2745^2 .

It is a cyclic number.

It is not a de Polignac number, because 209118229 - 2⁵ = 209118197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 209118194 and 209118203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209118223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104559114 + 104559115.

It is an arithmetic number, because the mean of its divisors is an integer number (104559115).

Almost surely, 2^209118229 is an apocalyptic number.

It is an amenable number.

209118229 is a deficient number, since it is larger than the sum of its proper divisors (1).

209118229 is an equidigital number, since it uses as much as digits as its factorization.

209118229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 209118229 is about 14460.9207521513. The cubic root of 209118229 is about 593.5590951321.

The spelling of 209118229 in words is "two hundred nine million, one hundred eighteen thousand, two hundred twenty-nine".