205384489 has 2 divisors, whose sum is σ = 205384490. Its totient is φ = 205384488.

The previous prime is 205384481. The next prime is 205384493. The reversal of 205384489 is 984483502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104040000 + 101344489 = 10200^2 + 10067^2 .

It is a cyclic number.

It is not a de Polignac number, because 205384489 - 2³ = 205384481 is a prime.

It is a super-2 number, since 2×205384489² = 84365576643582242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (205384481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102692244 + 102692245.

It is an arithmetic number, because the mean of its divisors is an integer number (102692245).

Almost surely, 2^205384489 is an apocalyptic number.

It is an amenable number.

205384489 is a deficient number, since it is larger than the sum of its proper divisors (1).

205384489 is an equidigital number, since it uses as much as digits as its factorization.

205384489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 276480, while the sum is 43.

The square root of 205384489 is about 14331.2417117290. The cubic root of 205384489 is about 590.0052561056.

The spelling of 205384489 in words is "two hundred five million, three hundred eighty-four thousand, four hundred eighty-nine".