205135216 has 40 divisors (see below), whose sum is σ = 466938864. Its totient is φ = 86069760.

The previous prime is 205135207. The next prime is 205135237. The reversal of 205135216 is 612531502.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 42541 + ... + 47116.

Almost surely, 2^205135216 is an apocalyptic number.

205135216 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

205135216 is an abundant number, since it is smaller than the sum of its proper divisors (261803648).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205135216 is a wasteful number, since it uses less digits than its factorization.

205135216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89689 (or 89683 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 205135216 is about 14322.5422324390. The cubic root of 205135216 is about 589.7664650766.

Adding to 205135216 its reverse (612531502), we get a palindrome (817666718).

The spelling of 205135216 in words is "two hundred five million, one hundred thirty-five thousand, two hundred sixteen".