205242659 has 4 divisors (see below), whose sum is σ = 209115216. Its totient is φ = 201370104.

The previous prime is 205242629. The next prime is 205242671. The reversal of 205242659 is 956242502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 205242659 - 2¹² = 205238563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205242619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1936199 + ... + 1936304.

It is an arithmetic number, because the mean of its divisors is an integer number (52278804).

Almost surely, 2^205242659 is an apocalyptic number.

205242659 is a deficient number, since it is larger than the sum of its proper divisors (3872557).

205242659 is an equidigital number, since it uses as much as digits as its factorization.

205242659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3872556.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 205242659 is about 14326.2925769370. The cubic root of 205242659 is about 589.8694137880.

The spelling of 205242659 in words is "two hundred five million, two hundred forty-two thousand, six hundred fifty-nine".