204942109 has 2 divisors, whose sum is σ = 204942110. Its totient is φ = 204942108.

The previous prime is 204942083. The next prime is 204942131. The reversal of 204942109 is 901249402.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202920025 + 2022084 = 14245^2 + 1422^2 .

It is a cyclic number.

It is not a de Polignac number, because 204942109 - 2¹³ = 204933917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204942509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102471054 + 102471055.

It is an arithmetic number, because the mean of its divisors is an integer number (102471055).

Almost surely, 2^204942109 is an apocalyptic number.

It is an amenable number.

204942109 is a deficient number, since it is larger than the sum of its proper divisors (1).

204942109 is an equidigital number, since it uses as much as digits as its factorization.

204942109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 204942109 is about 14315.7992791182. The cubic root of 204942109 is about 589.5813452478.

The spelling of 204942109 in words is "two hundred four million, nine hundred forty-two thousand, one hundred nine".