206424689 has 2 divisors, whose sum is σ = 206424690. Its totient is φ = 206424688.

The previous prime is 206424643. The next prime is 206424763. The reversal of 206424689 is 986424602.

206424689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 184960000 + 21464689 = 13600^2 + 4633^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206424689 is a prime.

It is a super-2 number, since 2×206424689² = 85222304457493442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (206424389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103212344 + 103212345.

It is an arithmetic number, because the mean of its divisors is an integer number (103212345).

Almost surely, 2^206424689 is an apocalyptic number.

It is an amenable number.

206424689 is a deficient number, since it is larger than the sum of its proper divisors (1).

206424689 is an equidigital number, since it uses as much as digits as its factorization.

206424689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 41.

The square root of 206424689 is about 14367.4872194131. The cubic root of 206424689 is about 590.9996354413. Note that the first 3 decimals are identical.

The spelling of 206424689 in words is "two hundred six million, four hundred twenty-four thousand, six hundred eighty-nine".