205125215 has 4 divisors (see below), whose sum is σ = 246150264. Its totient is φ = 164100168.

The previous prime is 205125209. The next prime is 205125253. The reversal of 205125215 is 512521502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 512521502 = 2 ⋅256260751.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205125215 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20512517 + ... + 20512526.

It is an arithmetic number, because the mean of its divisors is an integer number (61537566).

Almost surely, 2^205125215 is an apocalyptic number.

205125215 is a deficient number, since it is larger than the sum of its proper divisors (41025049).

205125215 is an equidigital number, since it uses as much as digits as its factorization.

205125215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41025048.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 205125215 is about 14322.1930932382. The cubic root of 205125215 is about 589.7568805850.

Adding to 205125215 its reverse (512521502), we get a palindrome (717646717).

The spelling of 205125215 in words is "two hundred five million, one hundred twenty-five thousand, two hundred fifteen".