205105045 has 8 divisors (see below), whose sum is σ = 248664024. Its totient is φ = 162392064.

The previous prime is 205105009. The next prime is 205105067. The reversal of 205105045 is 540501502.

It can be written as a sum of positive squares in 4 ways, for example, as 19000881 + 186104164 = 4359^2 + 13642^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205105045 - 2⁷ = 205104917 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 7 ways as a sum of consecutive naturals, for example, 210964 + ... + 211933.

It is an arithmetic number, because the mean of its divisors is an integer number (31083003).

Almost surely, 2^205105045 is an apocalyptic number.

It is an amenable number.

205105045 is a deficient number, since it is larger than the sum of its proper divisors (43558979).

205105045 is an equidigital number, since it uses as much as digits as its factorization.

205105045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422999.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 205105045 is about 14321.4889239911. The cubic root of 205105045 is about 589.7375496506.

Adding to 205105045 its reverse (540501502), we get a palindrome (745606547).

The spelling of 205105045 in words is "two hundred five million, one hundred five thousand, forty-five".