206389121 has 16 divisors (see below), whose sum is σ = 217945728. Its totient is φ = 195216000.

The previous prime is 206389111. The next prime is 206389123. The reversal of 206389121 is 121983602.

206389121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 206389121 - 2¹⁰ = 206388097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (206389123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 294071 + ... + 294771.

It is an arithmetic number, because the mean of its divisors is an integer number (13621608).

Almost surely, 2^206389121 is an apocalyptic number.

It is an amenable number.

206389121 is a deficient number, since it is larger than the sum of its proper divisors (11556607).

206389121 is a wasteful number, since it uses less digits than its factorization.

206389121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 206389121 is about 14366.2493713565. The cubic root of 206389121 is about 590.9656894333.

The spelling of 206389121 in words is "two hundred six million, three hundred eighty-nine thousand, one hundred twenty-one".