205134945 has 16 divisors (see below), whose sum is σ = 328751232. Its totient is φ = 109226880.

The previous prime is 205134911. The next prime is 205134947. The reversal of 205134945 is 549431502.

205134945 = T₄₇₀ + T₄₇₁ + ... + T₁₁₀₀.

It is not a de Polignac number, because 205134945 - 2¹⁴ = 205118561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205134947) 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, 1372 + ... + 20301.

It is an arithmetic number, because the mean of its divisors is an integer number (20546952).

Almost surely, 2^205134945 is an apocalyptic number.

It is an amenable number.

205134945 is a deficient number, since it is larger than the sum of its proper divisors (123616287).

205134945 is a wasteful number, since it uses less digits than its factorization.

205134945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22312.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 205134945 is about 14322.5327718250. The cubic root of 205134945 is about 589.7662053669.

The spelling of 205134945 in words is "two hundred five million, one hundred thirty-four thousand, nine hundred forty-five".