205541639 has 8 divisors (see below), whose sum is σ = 225767040. Its totient is φ = 186257016.

The previous prime is 205541629. The next prime is 205541659. The reversal of 205541639 is 936145502.

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 205541639 - 2⁸ = 205541383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205541599 and 205541608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205541629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234737 + ... + 235610.

It is an arithmetic number, because the mean of its divisors is an integer number (28220880).

Almost surely, 2^205541639 is an apocalyptic number.

205541639 is a deficient number, since it is larger than the sum of its proper divisors (20225401).

205541639 is a wasteful number, since it uses less digits than its factorization.

205541639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470389.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 205541639 is about 14336.7234401728. The cubic root of 205541639 is about 590.1556986381.

The spelling of 205541639 in words is "two hundred five million, five hundred forty-one thousand, six hundred thirty-nine".