205289091 has 96 divisors (see below), whose sum is σ = 377395200. Its totient is φ = 104924160.

The previous prime is 205289089. The next prime is 205289113. The reversal of 205289091 is 190982502.

205289091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 205289091 - 2¹ = 205289089 is a prime.

It is a super-2 number, since 2×205289091² = 84287221767212562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (205289011) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2306575 + ... + 2306663.

It is an arithmetic number, because the mean of its divisors is an integer number (3931200).

Almost surely, 2^205289091 is an apocalyptic number.

205289091 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

205289091 is a deficient number, since it is larger than the sum of its proper divisors (172106109).

205289091 is a wasteful number, since it uses less digits than its factorization.

205289091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209 (or 206 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 205289091 is about 14327.9130022484. The cubic root of 205289091 is about 589.9138924418.

The spelling of 205289091 in words is "two hundred five million, two hundred eighty-nine thousand, ninety-one".