204535139 has 4 divisors (see below), whose sum is σ = 204877200. Its totient is φ = 204193080.

The previous prime is 204535129. The next prime is 204535141. The reversal of 204535139 is 931535402.

204535139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 204535139 - 2²⁴ = 187757923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204535129) 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, 170132 + ... + 171329.

It is an arithmetic number, because the mean of its divisors is an integer number (51219300).

Almost surely, 2^204535139 is an apocalyptic number.

204535139 is a deficient number, since it is larger than the sum of its proper divisors (342061).

204535139 is an equidigital number, since it uses as much as digits as its factorization.

204535139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342060.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 204535139 is about 14301.5781996254. The cubic root of 204535139 is about 589.1908269682.

The spelling of 204535139 in words is "two hundred four million, five hundred thirty-five thousand, one hundred thirty-nine".