206681139 has 40 divisors (see below), whose sum is σ = 356378880. Its totient is φ = 116923824.

The previous prime is 206681129. The next prime is 206681141. The reversal of 206681139 is 931186602.

It is not a de Polignac number, because 206681139 - 2¹¹ = 206679091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206681119) 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 39 ways as a sum of consecutive naturals, for example, 56632 + ... + 60170.

It is an arithmetic number, because the mean of its divisors is an integer number (8909472).

Almost surely, 2^206681139 is an apocalyptic number.

206681139 is a deficient number, since it is larger than the sum of its proper divisors (149697741).

206681139 is a wasteful number, since it uses less digits than its factorization.

206681139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3661 (or 3652 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 206681139 is about 14376.4091135443. The cubic root of 206681139 is about 591.2442753254.

The spelling of 206681139 in words is "two hundred six million, six hundred eighty-one thousand, one hundred thirty-nine".