205309315 has 4 divisors (see below), whose sum is σ = 246371184. Its totient is φ = 164247448.

The previous prime is 205309309. The next prime is 205309393. The reversal of 205309315 is 513903502.

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 205309315 - 2⁵ = 205309283 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 20530927 + ... + 20530936.

It is an arithmetic number, because the mean of its divisors is an integer number (61592796).

Almost surely, 2^205309315 is an apocalyptic number.

205309315 is a deficient number, since it is larger than the sum of its proper divisors (41061869).

205309315 is an equidigital number, since it uses as much as digits as its factorization.

205309315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41061868.

The product of its (nonzero) digits is 4050, while the sum is 28.

The square root of 205309315 is about 14328.6187401298. The cubic root of 205309315 is about 589.9332635422.

The spelling of 205309315 in words is "two hundred five million, three hundred nine thousand, three hundred fifteen".