206288669 has 2 divisors, whose sum is σ = 206288670. Its totient is φ = 206288668.

The previous prime is 206288657. The next prime is 206288683. The reversal of 206288669 is 966882602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183602500 + 22686169 = 13550^2 + 4763^2 .

It is a cyclic number.

It is not a de Polignac number, because 206288669 - 2²⁰ = 205240093 is a prime.

It is a super-2 number, since 2×206288669² = 85110029915583122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206288569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103144334 + 103144335.

It is an arithmetic number, because the mean of its divisors is an integer number (103144335).

Almost surely, 2^206288669 is an apocalyptic number.

It is an amenable number.

206288669 is a deficient number, since it is larger than the sum of its proper divisors (1).

206288669 is an equidigital number, since it uses as much as digits as its factorization.

206288669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 497664, while the sum is 47.

The square root of 206288669 is about 14362.7528350243. The cubic root of 206288669 is about 590.8697972358.

The spelling of 206288669 in words is "two hundred six million, two hundred eighty-eight thousand, six hundred sixty-nine".