205122015 has 24 divisors (see below), whose sum is σ = 406337568. Its totient is φ = 93769920.

The previous prime is 205121993. The next prime is 205122023. The reversal of 205122015 is 510221502.

It is not a de Polignac number, because 205122015 - 2¹⁹ = 204597727 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 325276 + ... + 325905.

It is an arithmetic number, because the mean of its divisors is an integer number (16930732).

Almost surely, 2^205122015 is an apocalyptic number.

205122015 is a deficient number, since it is larger than the sum of its proper divisors (201215553).

205122015 is a wasteful number, since it uses less digits than its factorization.

205122015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651199 (or 651196 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 205122015 is about 14322.0813780679. The cubic root of 205122015 is about 589.7538137885.

Adding to 205122015 its reverse (510221502), we get a palindrome (715343517).

The spelling of 205122015 in words is "two hundred five million, one hundred twenty-two thousand, fifteen".