206385121 has 4 divisors (see below), whose sum is σ = 208211652. Its totient is φ = 204558592.

The previous prime is 206385119. The next prime is 206385161. The reversal of 206385121 is 121583602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 75603025 + 130782096 = 8695^2 + 11436^2 .

It is a cyclic number.

It is not a de Polignac number, because 206385121 - 2¹ = 206385119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 206385121.

It is not an unprimeable number, because it can be changed into a prime (206385161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 913096 + ... + 913321.

It is an arithmetic number, because the mean of its divisors is an integer number (52052913).

Almost surely, 2^206385121 is an apocalyptic number.

It is an amenable number.

206385121 is a deficient number, since it is larger than the sum of its proper divisors (1826531).

206385121 is a wasteful number, since it uses less digits than its factorization.

206385121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1826530.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 206385121 is about 14366.1101555014. The cubic root of 206385121 is about 590.9618715996.

The spelling of 206385121 in words is "two hundred six million, three hundred eighty-five thousand, one hundred twenty-one".