206998109 has 2 divisors, whose sum is σ = 206998110. Its totient is φ = 206998108.

The previous prime is 206998073. The next prime is 206998111. The reversal of 206998109 is 901899602.

206998109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200222500 + 6775609 = 14150^2 + 2603^2 .

It is a cyclic number.

It is not a de Polignac number, because 206998109 - 2¹² = 206994013 is a prime.

Together with 206998111, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206998109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206998159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103499054 + 103499055.

It is an arithmetic number, because the mean of its divisors is an integer number (103499055).

Almost surely, 2^206998109 is an apocalyptic number.

It is an amenable number.

206998109 is a deficient number, since it is larger than the sum of its proper divisors (1).

206998109 is an equidigital number, since it uses as much as digits as its factorization.

206998109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 206998109 is about 14387.4288529952. The cubic root of 206998109 is about 591.5463686480.

The spelling of 206998109 in words is "two hundred six million, nine hundred ninety-eight thousand, one hundred nine".