205091042 has 8 divisors (see below), whose sum is σ = 331300956. Its totient is φ = 94657392.

The previous prime is 205091017. The next prime is 205091099. The reversal of 205091042 is 240190502.

205091042 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 14321²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 205091041 + 1 = 14321^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 205090999 and 205091017.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3944033 + ... + 3944084.

Almost surely, 2^205091042 is an apocalyptic number.

205091042 is a deficient number, since it is larger than the sum of its proper divisors (126209914).

205091042 is a wasteful number, since it uses less digits than its factorization.

205091042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7888132.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 205091042 is about 14321.0000349138. Note that the first 4 decimals coincide. The cubic root of 205091042 is about 589.7241284257.

The spelling of 205091042 in words is "two hundred five million, ninety-one thousand, forty-two".