195165109 has 2 divisors, whose sum is σ = 195165110. Its totient is φ = 195165108.

The previous prime is 195165107. The next prime is 195165193. The reversal of 195165109 is 901561591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165842884 + 29322225 = 12878^2 + 5415^2 .

It is a cyclic number.

It is not a de Polignac number, because 195165109 - 2¹ = 195165107 is a prime.

Together with 195165107, 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 (195165107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97582554 + 97582555.

It is an arithmetic number, because the mean of its divisors is an integer number (97582555).

Almost surely, 2^195165109 is an apocalyptic number.

It is an amenable number.

195165109 is a deficient number, since it is larger than the sum of its proper divisors (1).

195165109 is an equidigital number, since it uses as much as digits as its factorization.

195165109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12150, while the sum is 37.

The square root of 195165109 is about 13970.1506434254. The cubic root of 195165109 is about 580.0526200773.

The spelling of 195165109 in words is "one hundred ninety-five million, one hundred sixty-five thousand, one hundred nine".