195844109 has 2 divisors, whose sum is σ = 195844110. Its totient is φ = 195844108.

The previous prime is 195844091. The next prime is 195844123. The reversal of 195844109 is 901448591.

Together with previous prime (195844091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154306084 + 41538025 = 12422^2 + 6445^2 .

It is a cyclic number.

It is not a de Polignac number, because 195844109 - 2¹² = 195840013 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195844139) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97922054 + 97922055.

It is an arithmetic number, because the mean of its divisors is an integer number (97922055).

Almost surely, 2^195844109 is an apocalyptic number.

It is an amenable number.

195844109 is a deficient number, since it is larger than the sum of its proper divisors (1).

195844109 is an equidigital number, since it uses as much as digits as its factorization.

195844109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 195844109 is about 13994.4313567933. The cubic root of 195844109 is about 580.7245295469.

The spelling of 195844109 in words is "one hundred ninety-five million, eight hundred forty-four thousand, one hundred nine".