205157217 has 16 divisors (see below), whose sum is σ = 285775488. Its totient is φ = 130669440.

The previous prime is 205157203. The next prime is 205157221. The reversal of 205157217 is 712751502.

205157217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 205157217 - 2⁴ = 205157201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205157917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94213 + ... + 96365.

It is an arithmetic number, because the mean of its divisors is an integer number (17860968).

Almost surely, 2^205157217 is an apocalyptic number.

It is an amenable number.

205157217 is a deficient number, since it is larger than the sum of its proper divisors (80618271).

205157217 is a wasteful number, since it uses less digits than its factorization.

205157217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3560.

The product of its (nonzero) digits is 4900, while the sum is 30.

The square root of 205157217 is about 14323.3102668343. The cubic root of 205157217 is about 589.7875487117.

The spelling of 205157217 in words is "two hundred five million, one hundred fifty-seven thousand, two hundred seventeen".