205250009091 has 8 divisors (see below), whose sum is σ = 281063075664. Its totient is φ = 133135140960.

The previous prime is 205250009089. The next prime is 205250009117. The reversal of 205250009091 is 190900052502.

205250009091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 205250009091 - 2¹ = 205250009089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205250009071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 924549480 + ... + 924549701.

It is an arithmetic number, because the mean of its divisors is an integer number (35132884458).

Almost surely, 2^205250009091 is an apocalyptic number.

205250009091 is a deficient number, since it is larger than the sum of its proper divisors (75813066573).

205250009091 is a wasteful number, since it uses less digits than its factorization.

205250009091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1849099221.

The product of its (nonzero) digits is 8100, while the sum is 33.

The spelling of 205250009091 in words is "two hundred five billion, two hundred fifty million, nine thousand, ninety-one".