205268089 has 4 divisors (see below), whose sum is σ = 221057956. Its totient is φ = 189478224.

The previous prime is 205268069. The next prime is 205268093. The reversal of 205268089 is 980862502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 980862502 = 2 ⋅490431251.

It can be written as a sum of positive squares in 2 ways, for example, as 36060025 + 169208064 = 6005^2 + 13008^2 .

It is not a de Polignac number, because 205268089 - 2⁹ = 205267577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205268009) 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, 7894914 + ... + 7894939.

It is an arithmetic number, because the mean of its divisors is an integer number (55264489).

Almost surely, 2^205268089 is an apocalyptic number.

It is an amenable number.

205268089 is a deficient number, since it is larger than the sum of its proper divisors (15789867).

205268089 is a wasteful number, since it uses less digits than its factorization.

205268089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15789866.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 205268089 is about 14327.1800784383. The cubic root of 205268089 is about 589.8937748050.

The spelling of 205268089 in words is "two hundred five million, two hundred sixty-eight thousand, eighty-nine".