206631639 has 12 divisors (see below), whose sum is σ = 298974000. Its totient is φ = 137520864.

The previous prime is 206631559. The next prime is 206631653. The reversal of 206631639 is 936136602.

It is not a de Polignac number, because 206631639 - 2¹⁹ = 206107351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206631539) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13774 + ... + 24555.

It is an arithmetic number, because the mean of its divisors is an integer number (24914500).

Almost surely, 2^206631639 is an apocalyptic number.

206631639 is a deficient number, since it is larger than the sum of its proper divisors (92342361).

206631639 is a wasteful number, since it uses less digits than its factorization.

206631639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38934 (or 38931 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 36.

The square root of 206631639 is about 14374.6874400802. The cubic root of 206631639 is about 591.1970706820.

The spelling of 206631639 in words is "two hundred six million, six hundred thirty-one thousand, six hundred thirty-nine".