206405313 has 16 divisors (see below), whose sum is σ = 294912576. Its totient is φ = 127946240.

The previous prime is 206405299. The next prime is 206405323. The reversal of 206405313 is 313504602.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 206405313 - 2⁵ = 206405281 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (206405323) 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, 20148 + ... + 28613.

It is an arithmetic number, because the mean of its divisors is an integer number (18432036).

Almost surely, 2^206405313 is an apocalyptic number.

It is an amenable number.

206405313 is a deficient number, since it is larger than the sum of its proper divisors (88507263).

206405313 is a wasteful number, since it uses less digits than its factorization.

206405313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48864.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 206405313 is about 14366.8129033547. The cubic root of 206405313 is about 590.9811435202.

Adding to 206405313 its reverse (313504602), we get a palindrome (519909915).

The spelling of 206405313 in words is "two hundred six million, four hundred five thousand, three hundred thirteen".