206772109 has 2 divisors, whose sum is σ = 206772110. Its totient is φ = 206772108.

The previous prime is 206772107. The next prime is 206772113. The reversal of 206772109 is 901277602.

206772109 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., 175165225 + 31606884 = 13235^2 + 5622^2 .

It is a cyclic number.

It is not a de Polignac number, because 206772109 - 2¹ = 206772107 is a prime.

Together with 206772107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206772101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103386054 + 103386055.

It is an arithmetic number, because the mean of its divisors is an integer number (103386055).

Almost surely, 2^206772109 is an apocalyptic number.

It is an amenable number.

206772109 is a deficient number, since it is larger than the sum of its proper divisors (1).

206772109 is an equidigital number, since it uses as much as digits as its factorization.

206772109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 206772109 is about 14379.5726292543. The cubic root of 206772109 is about 591.3310073203.

The spelling of 206772109 in words is "two hundred six million, seven hundred seventy-two thousand, one hundred nine".