205121039 has 2 divisors, whose sum is σ = 205121040. Its totient is φ = 205121038.

The previous prime is 205121023. The next prime is 205121047. The reversal of 205121039 is 930121502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205121039 - 2⁴ = 205121023 is a prime.

It is a Chen prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205121009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102560519 + 102560520.

It is an arithmetic number, because the mean of its divisors is an integer number (102560520).

Almost surely, 2^205121039 is an apocalyptic number.

205121039 is a deficient number, since it is larger than the sum of its proper divisors (1).

205121039 is an equidigital number, since it uses as much as digits as its factorization.

205121039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 205121039 is about 14322.0473047676. The cubic root of 205121039 is about 589.7528784093.

The spelling of 205121039 in words is "two hundred five million, one hundred twenty-one thousand, thirty-nine".