205042039 has 2 divisors, whose sum is σ = 205042040. Its totient is φ = 205042038.

The previous prime is 205042031. The next prime is 205042069. The reversal of 205042039 is 930240502.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205042039 - 2³ = 205042031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205042031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102521019 + 102521020.

It is an arithmetic number, because the mean of its divisors is an integer number (102521020).

Almost surely, 2^205042039 is an apocalyptic number.

205042039 is a deficient number, since it is larger than the sum of its proper divisors (1).

205042039 is an equidigital number, since it uses as much as digits as its factorization.

205042039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 205042039 is about 14319.2890535808. The cubic root of 205042039 is about 589.6771565166.

The spelling of 205042039 in words is "two hundred five million, forty-two thousand, thirty-nine".