205315215 has 32 divisors (see below), whose sum is σ = 388385280. Its totient is φ = 90620544.

The previous prime is 205315211. The next prime is 205315219. The reversal of 205315215 is 512513502.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (205315211) and next prime (205315219).

It is not a de Polignac number, because 205315215 - 2² = 205315211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205315211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30669 + ... + 36758.

It is an arithmetic number, because the mean of its divisors is an integer number (12137040).

Almost surely, 2^205315215 is an apocalyptic number.

205315215 is a deficient number, since it is larger than the sum of its proper divisors (183070065).

205315215 is a wasteful number, since it uses less digits than its factorization.

205315215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67471.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 205315215 is about 14328.8246203239. The cubic root of 205315215 is about 589.9389144839.

Adding to 205315215 its reverse (512513502), we get a palindrome (717828717).

The spelling of 205315215 in words is "two hundred five million, three hundred fifteen thousand, two hundred fifteen".