206983729 has 2 divisors, whose sum is σ = 206983730. Its totient is φ = 206983728.

The previous prime is 206983727. The next prime is 206983771. The reversal of 206983729 is 927389602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122766400 + 84217329 = 11080^2 + 9177^2 .

It is a cyclic number.

It is not a de Polignac number, because 206983729 - 2¹ = 206983727 is a prime.

Together with 206983727, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (206983727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103491864 + 103491865.

It is an arithmetic number, because the mean of its divisors is an integer number (103491865).

Almost surely, 2^206983729 is an apocalyptic number.

It is an amenable number.

206983729 is a deficient number, since it is larger than the sum of its proper divisors (1).

206983729 is an equidigital number, since it uses as much as digits as its factorization.

206983729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 206983729 is about 14386.9291024874. The cubic root of 206983729 is about 591.5326702398.

The spelling of 206983729 in words is "two hundred six million, nine hundred eighty-three thousand, seven hundred twenty-nine".