206847139 has 2 divisors, whose sum is σ = 206847140. Its totient is φ = 206847138.

The previous prime is 206847103. The next prime is 206847149. The reversal of 206847139 is 931748602.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206847139 is a prime.

It is not a weakly prime, because it can be changed into another prime (206847149) 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 as a sum of consecutive naturals, namely, 103423569 + 103423570.

It is an arithmetic number, because the mean of its divisors is an integer number (103423570).

Almost surely, 2^206847139 is an apocalyptic number.

206847139 is a deficient number, since it is larger than the sum of its proper divisors (1).

206847139 is an equidigital number, since it uses as much as digits as its factorization.

206847139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 206847139 is about 14382.1813018749. The cubic root of 206847139 is about 591.4025227684.

The spelling of 206847139 in words is "two hundred six million, eight hundred forty-seven thousand, one hundred thirty-nine".