205062409 has 2 divisors, whose sum is σ = 205062410. Its totient is φ = 205062408.

The previous prime is 205062349. The next prime is 205062437. The reversal of 205062409 is 904260502.

It is an a-pointer prime, because the next prime (205062437) can be obtained adding 205062409 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205062400 + 9 = 14320^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 205062409 - 2⁷ = 205062281 is a prime.

It is not a weakly prime, because it can be changed into another prime (205062439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102531204 + 102531205.

It is an arithmetic number, because the mean of its divisors is an integer number (102531205).

Almost surely, 2^205062409 is an apocalyptic number.

It is an amenable number.

205062409 is a deficient number, since it is larger than the sum of its proper divisors (1).

205062409 is an equidigital number, since it uses as much as digits as its factorization.

205062409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 205062409 is about 14320.0003142458. Note that the first 3 decimals coincide. The cubic root of 205062409 is about 589.6966831235.

The spelling of 205062409 in words is "two hundred five million, sixty-two thousand, four hundred nine".