204240109 has 2 divisors, whose sum is σ = 204240110. Its totient is φ = 204240108.

The previous prime is 204240103. The next prime is 204240131. The reversal of 204240109 is 901042402.

It is an a-pointer prime, because the next prime (204240131) can be obtained adding 204240109 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 174319209 + 29920900 = 13203^2 + 5470^2 .

It is a cyclic number.

It is not a de Polignac number, because 204240109 - 2⁵ = 204240077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204240109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204240103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102120054 + 102120055.

It is an arithmetic number, because the mean of its divisors is an integer number (102120055).

Almost surely, 2^204240109 is an apocalyptic number.

It is an amenable number.

204240109 is a deficient number, since it is larger than the sum of its proper divisors (1).

204240109 is an equidigital number, since it uses as much as digits as its factorization.

204240109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 204240109 is about 14291.2598814800. The cubic root of 204240109 is about 588.9073995223.

The spelling of 204240109 in words is "two hundred four million, two hundred forty thousand, one hundred nine".