205489079 has 2 divisors, whose sum is σ = 205489080. Its totient is φ = 205489078.

The previous prime is 205489073. The next prime is 205489091. The reversal of 205489079 is 970984502.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205489079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205489073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102744539 + 102744540.

It is an arithmetic number, because the mean of its divisors is an integer number (102744540).

Almost surely, 2^205489079 is an apocalyptic number.

205489079 is a deficient number, since it is larger than the sum of its proper divisors (1).

205489079 is an equidigital number, since it uses as much as digits as its factorization.

205489079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 205489079 is about 14334.8902681534. The cubic root of 205489079 is about 590.1053905383.

The spelling of 205489079 in words is "two hundred five million, four hundred eighty-nine thousand, seventy-nine".