205001289 has 6 divisors (see below), whose sum is σ = 296112986. Its totient is φ = 136667520.

The previous prime is 205001281. The next prime is 205001309. The reversal of 205001289 is 982100502.

It can be written as a sum of positive squares in only one way, i.e., 121881600 + 83119689 = 11040^2 + 9117^2 .

It is not a de Polignac number, because 205001289 - 2³ = 205001281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205001281) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11388952 + ... + 11388969.

Almost surely, 2^205001289 is an apocalyptic number.

It is an amenable number.

205001289 is a deficient number, since it is larger than the sum of its proper divisors (91111697).

205001289 is a wasteful number, since it uses less digits than its factorization.

205001289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22777927 (or 22777924 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 205001289 is about 14317.8660770382. The cubic root of 205001289 is about 589.6380898349.

The spelling of 205001289 in words is "two hundred five million, one thousand, two hundred eighty-nine".