205505143 has 8 divisors (see below), whose sum is σ = 207643248. Its totient is φ = 203378304.

The previous prime is 205505137. The next prime is 205505171. The reversal of 205505143 is 341505502.

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 205505143 - 2²¹ = 203407991 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 (205505173) 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 7 ways as a sum of consecutive naturals, for example, 36655 + ... + 41887.

It is an arithmetic number, because the mean of its divisors is an integer number (25955406).

Almost surely, 2^205505143 is an apocalyptic number.

205505143 is a deficient number, since it is larger than the sum of its proper divisors (2138105).

205505143 is a wasteful number, since it uses less digits than its factorization.

205505143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5633.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 205505143 is about 14335.4505684335. The cubic root of 205505143 is about 590.1207671965.

The spelling of 205505143 in words is "two hundred five million, five hundred five thousand, one hundred forty-three".