206424109 has 2 divisors, whose sum is σ = 206424110. Its totient is φ = 206424108.

The previous prime is 206424107. The next prime is 206424143. The reversal of 206424109 is 901424602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 203148009 + 3276100 = 14253^2 + 1810^2 .

It is a cyclic number.

It is not a de Polignac number, because 206424109 - 2¹ = 206424107 is a prime.

It is a super-2 number, since 2×206424109² = 85221825552887762, which contains 22 as substring.

Together with 206424107, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206424107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103212054 + 103212055.

It is an arithmetic number, because the mean of its divisors is an integer number (103212055).

Almost surely, 2^206424109 is an apocalyptic number.

It is an amenable number.

206424109 is a deficient number, since it is larger than the sum of its proper divisors (1).

206424109 is an equidigital number, since it uses as much as digits as its factorization.

206424109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 206424109 is about 14367.4670349370. The cubic root of 206424109 is about 590.9990819221. Note that the first 3 decimals are identical.

The spelling of 206424109 in words is "two hundred six million, four hundred twenty-four thousand, one hundred nine".