195142109 has 2 divisors, whose sum is σ = 195142110. Its totient is φ = 195142108.

The previous prime is 195142091. The next prime is 195142163. The reversal of 195142109 is 901241591.

Together with previous prime (195142091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183602500 + 11539609 = 13550^2 + 3397^2 .

It is a cyclic number.

It is not a de Polignac number, because 195142109 - 2⁸ = 195141853 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 (195142169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97571054 + 97571055.

It is an arithmetic number, because the mean of its divisors is an integer number (97571055).

Almost surely, 2^195142109 is an apocalyptic number.

It is an amenable number.

195142109 is a deficient number, since it is larger than the sum of its proper divisors (1).

195142109 is an equidigital number, since it uses as much as digits as its factorization.

195142109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 195142109 is about 13969.3274354924. The cubic root of 195142109 is about 580.0298329879.

The spelling of 195142109 in words is "one hundred ninety-five million, one hundred forty-two thousand, one hundred nine".