205135387 has 4 divisors (see below), whose sum is σ = 209005920. Its totient is φ = 201264856.

The previous prime is 205135361. The next prime is 205135417. The reversal of 205135387 is 783531502.

205135387 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 a de Polignac number, because none of the positive numbers 2^k-205135387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205135187) 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, 1935187 + ... + 1935292.

It is an arithmetic number, because the mean of its divisors is an integer number (52251480).

Almost surely, 2^205135387 is an apocalyptic number.

205135387 is a deficient number, since it is larger than the sum of its proper divisors (3870533).

205135387 is an equidigital number, since it uses as much as digits as its factorization.

205135387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3870532.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 205135387 is about 14322.5482020484. The cubic root of 205135387 is about 589.7666289523.

Adding to 205135387 its reverse (783531502), we get a palindrome (988666889).

The spelling of 205135387 in words is "two hundred five million, one hundred thirty-five thousand, three hundred eighty-seven".