195000109 has 2 divisors, whose sum is σ = 195000110. Its totient is φ = 195000108.

The previous prime is 195000107. The next prime is 195000119. The reversal of 195000109 is 901000591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188512900 + 6487209 = 13730^2 + 2547^2 .

It is a cyclic number.

It is not a de Polignac number, because 195000109 - 2¹ = 195000107 is a prime.

Together with 195000107, 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 (195000107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97500054 + 97500055.

It is an arithmetic number, because the mean of its divisors is an integer number (97500055).

Almost surely, 2^195000109 is an apocalyptic number.

It is an amenable number.

195000109 is a deficient number, since it is larger than the sum of its proper divisors (1).

195000109 is an equidigital number, since it uses as much as digits as its factorization.

195000109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 405, while the sum is 25.

The square root of 195000109 is about 13964.2439465945. The cubic root of 195000109 is about 579.8891078126.

The spelling of 195000109 in words is "one hundred ninety-five million, one hundred nine", and thus it is an aban number.