205555541 has 4 divisors (see below), whose sum is σ = 205716300. Its totient is φ = 205394784.

The previous prime is 205555507. The next prime is 205555549. The reversal of 205555541 is 145555502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 131767441 + 73788100 = 11479^2 + 8590^2 .

It is a cyclic number.

It is not a de Polignac number, because 205555541 - 2¹⁴ = 205539157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 205555498 and 205555507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205555549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78446 + ... + 81023.

It is an arithmetic number, because the mean of its divisors is an integer number (51429075).

Almost surely, 2^205555541 is an apocalyptic number.

It is an amenable number.

205555541 is a deficient number, since it is larger than the sum of its proper divisors (160759).

205555541 is a wasteful number, since it uses less digits than its factorization.

205555541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160758.

The product of its (nonzero) digits is 25000, while the sum is 32.

The square root of 205555541 is about 14337.2082707897. The cubic root of 205555541 is about 590.1690035814.

The spelling of 205555541 in words is "two hundred five million, five hundred fifty-five thousand, five hundred forty-one".