206551439 has 2 divisors, whose sum is σ = 206551440. Its totient is φ = 206551438.

The previous prime is 206551379. The next prime is 206551463. The reversal of 206551439 is 934155602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 206551439 - 2⁸ = 206551183 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 206551399 and 206551408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206551469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103275719 + 103275720.

It is an arithmetic number, because the mean of its divisors is an integer number (103275720).

Almost surely, 2^206551439 is an apocalyptic number.

206551439 is a deficient number, since it is larger than the sum of its proper divisors (1).

206551439 is an equidigital number, since it uses as much as digits as its factorization.

206551439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 206551439 is about 14371.8975434700. The cubic root of 206551439 is about 591.1205736187.

The spelling of 206551439 in words is "two hundred six million, five hundred fifty-one thousand, four hundred thirty-nine".