205475489 has 2 divisors, whose sum is σ = 205475490. Its totient is φ = 205475488.

The previous prime is 205475461. The next prime is 205475497. The reversal of 205475489 is 984574502.

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., 167443600 + 38031889 = 12940^2 + 6167^2 .

It is a cyclic number.

It is not a de Polignac number, because 205475489 - 2¹² = 205471393 is a prime.

It is not a weakly prime, because it can be changed into another prime (205475419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102737744 + 102737745.

It is an arithmetic number, because the mean of its divisors is an integer number (102737745).

Almost surely, 2^205475489 is an apocalyptic number.

It is an amenable number.

205475489 is a deficient number, since it is larger than the sum of its proper divisors (1).

205475489 is an equidigital number, since it uses as much as digits as its factorization.

205475489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 403200, while the sum is 44.

The square root of 205475489 is about 14334.4162420379. The cubic root of 205475489 is about 590.0923813975.

The spelling of 205475489 in words is "two hundred five million, four hundred seventy-five thousand, four hundred eighty-nine".