205109375 has 14 divisors (see below), whose sum is σ = 256402968. Its totient is φ = 164075000.

The previous prime is 205109371. The next prime is 205109407. The reversal of 205109375 is 573901502.

It is not a de Polignac number, because 205109375 - 2² = 205109371 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205109371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 9062 + ... + 22188.

Almost surely, 2^205109375 is an apocalyptic number.

205109375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

205109375 is a deficient number, since it is larger than the sum of its proper divisors (51293593).

205109375 is an frugal number, since it uses more digits than its factorization.

205109375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13157 (or 13132 counting only the distinct ones).

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 205109375 is about 14321.6400946260. The cubic root of 205109375 is about 589.7416996308.

The spelling of 205109375 in words is "two hundred five million, one hundred nine thousand, three hundred seventy-five".