205810541 has 4 divisors (see below), whose sum is σ = 207734112. Its totient is φ = 203886972.

The previous prime is 205810499. The next prime is 205810547. The reversal of 205810541 is 145018502.

205810541 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 205810541 - 2¹⁸ = 205548397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205810541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205810547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 961625 + ... + 961838.

It is an arithmetic number, because the mean of its divisors is an integer number (51933528).

Almost surely, 2^205810541 is an apocalyptic number.

It is an amenable number.

205810541 is a deficient number, since it is larger than the sum of its proper divisors (1923571).

205810541 is a wasteful number, since it uses less digits than its factorization.

205810541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1923570.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 205810541 is about 14346.0984591630. The cubic root of 205810541 is about 590.4129456114.

The spelling of 205810541 in words is "two hundred five million, eight hundred ten thousand, five hundred forty-one".