205016215 has 4 divisors (see below), whose sum is σ = 246019464. Its totient is φ = 164012968.

The previous prime is 205016197. The next prime is 205016219. The reversal of 205016215 is 512610502.

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 205016215 - 2⁵ = 205016183 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205016219) by changing a digit.

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, 20501617 + ... + 20501626.

It is an arithmetic number, because the mean of its divisors is an integer number (61504866).

Almost surely, 2^205016215 is an apocalyptic number.

205016215 is a deficient number, since it is larger than the sum of its proper divisors (41003249).

205016215 is an equidigital number, since it uses as much as digits as its factorization.

205016215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41003248.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 205016215 is about 14318.3873044418. The cubic root of 205016215 is about 589.6523998662.

Adding to 205016215 its reverse (512610502), we get a palindrome (717626717).

The spelling of 205016215 in words is "two hundred five million, sixteen thousand, two hundred fifteen".