206201639 has 4 divisors (see below), whose sum is σ = 235659024. Its totient is φ = 176744256.

The previous prime is 206201591. The next prime is 206201651. The reversal of 206201639 is 936102602.

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

It is a cyclic number.

It is not a de Polignac number, because 206201639 - 2¹² = 206197543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206201239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14728682 + ... + 14728695.

It is an arithmetic number, because the mean of its divisors is an integer number (58914756).

Almost surely, 2^206201639 is an apocalyptic number.

206201639 is a deficient number, since it is larger than the sum of its proper divisors (29457385).

206201639 is an equidigital number, since it uses as much as digits as its factorization.

206201639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29457384.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 206201639 is about 14359.7228037313. The cubic root of 206201639 is about 590.7866926039.

The spelling of 206201639 in words is "two hundred six million, two hundred one thousand, six hundred thirty-nine".