205120189 has 4 divisors (see below), whose sum is σ = 205161660. Its totient is φ = 205078720.

The previous prime is 205120183. The next prime is 205120231. The reversal of 205120189 is 981021502.

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

It can be written as a sum of positive squares in 2 ways, for example, as 37417689 + 167702500 = 6117^2 + 12950^2 .

It is a cyclic number.

It is not a de Polignac number, because 205120189 - 2¹⁷ = 204989117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205120183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12124 + ... + 23605.

It is an arithmetic number, because the mean of its divisors is an integer number (51290415).

Almost surely, 2^205120189 is an apocalyptic number.

It is an amenable number.

205120189 is a deficient number, since it is larger than the sum of its proper divisors (41471).

205120189 is an equidigital number, since it uses as much as digits as its factorization.

205120189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41470.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 205120189 is about 14322.0176302084. The cubic root of 205120189 is about 589.7520637835.

The spelling of 205120189 in words is "two hundred five million, one hundred twenty thousand, one hundred eighty-nine".