206902109 has 4 divisors (see below), whose sum is σ = 206943516. Its totient is φ = 206860704.

The previous prime is 206902099. The next prime is 206902117. The reversal of 206902109 is 901209602.

206902109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67732900 + 139169209 = 8230^2 + 11797^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206902109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206902159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11984 + ... + 23609.

It is an arithmetic number, because the mean of its divisors is an integer number (51735879).

Almost surely, 2^206902109 is an apocalyptic number.

It is an amenable number.

206902109 is a deficient number, since it is larger than the sum of its proper divisors (41407).

206902109 is an equidigital number, since it uses as much as digits as its factorization.

206902109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41406.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 206902109 is about 14384.0922202272. The cubic root of 206902109 is about 591.4549068904.

The spelling of 206902109 in words is "two hundred six million, nine hundred two thousand, one hundred nine".