205842549 has 16 divisors (see below), whose sum is σ = 300142080. Its totient is φ = 124446960.

The previous prime is 205842547. The next prime is 205842557. The reversal of 205842549 is 945248502.

It is not a de Polignac number, because 205842549 - 2¹ = 205842547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205842541) 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 15 ways as a sum of consecutive naturals, for example, 6384 + ... + 21270.

It is an arithmetic number, because the mean of its divisors is an integer number (18758880).

Almost surely, 2^205842549 is an apocalyptic number.

It is an amenable number.

205842549 is a deficient number, since it is larger than the sum of its proper divisors (94299531).

205842549 is a wasteful number, since it uses less digits than its factorization.

205842549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15320.

The product of its (nonzero) digits is 115200, while the sum is 39.

The square root of 205842549 is about 14347.2139804214. The cubic root of 205842549 is about 590.4435513615.

The spelling of 205842549 in words is "two hundred five million, eight hundred forty-two thousand, five hundred forty-nine".