206978011 has 2 divisors, whose sum is σ = 206978012. Its totient is φ = 206978010.

The previous prime is 206978003. The next prime is 206978021. The reversal of 206978011 is 110879602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 206978011 - 2³ = 206978003 is a prime.

It is a super-2 number, since 2×206978011² = 85679794075032242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (206978021) 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, 103489005 + 103489006.

It is an arithmetic number, because the mean of its divisors is an integer number (103489006).

Almost surely, 2^206978011 is an apocalyptic number.

206978011 is a deficient number, since it is larger than the sum of its proper divisors (1).

206978011 is an equidigital number, since it uses as much as digits as its factorization.

206978011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 206978011 is about 14386.7303790681. The cubic root of 206978011 is about 591.5272230887.

The spelling of 206978011 in words is "two hundred six million, nine hundred seventy-eight thousand, eleven".