205557049 has 4 divisors (see below), whose sum is σ = 214494336. Its totient is φ = 196619764.

The previous prime is 205557019. The next prime is 205557083. The reversal of 205557049 is 940755502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 940755502 = 2 ⋅470377751.

It is a cyclic number.

It is not a de Polignac number, because 205557049 - 2¹¹ = 205555001 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205556999 and 205557017.

It is not an unprimeable number, because it can be changed into a prime (205557019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4468609 + ... + 4468654.

It is an arithmetic number, because the mean of its divisors is an integer number (53623584).

Almost surely, 2^205557049 is an apocalyptic number.

It is an amenable number.

205557049 is a deficient number, since it is larger than the sum of its proper divisors (8937287).

205557049 is an equidigital number, since it uses as much as digits as its factorization.

205557049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8937286.

The product of its (nonzero) digits is 63000, while the sum is 37.

The square root of 205557049 is about 14337.2608611269. The cubic root of 205557049 is about 590.1704467804.

The spelling of 205557049 in words is "two hundred five million, five hundred fifty-seven thousand, forty-nine".