195169891 has 6 divisors (see below), whose sum is σ = 227034420. Its totient is φ = 167288436.

The previous prime is 195169883. The next prime is 195169901. The reversal of 195169891 is 198961591.

It is not a de Polignac number, because 195169891 - 2³ = 195169883 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 3983059 = 195169891 / (1 + 9 + 5 + 1 + 6 + 9 + 8 + 9 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195169801) by changing a digit.

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

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1991481 + ... + 1991578.

It is an arithmetic number, because the mean of its divisors is an integer number (37839070).

Almost surely, 2^195169891 is an apocalyptic number.

195169891 is a deficient number, since it is larger than the sum of its proper divisors (31864529).

195169891 is an equidigital number, since it uses as much as digits as its factorization.

195169891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3983073 (or 3983066 counting only the distinct ones).

The product of its digits is 174960, while the sum is 49.

The square root of 195169891 is about 13970.3217930010. The cubic root of 195169891 is about 580.0573575856.

The spelling of 195169891 in words is "one hundred ninety-five million, one hundred sixty-nine thousand, eight hundred ninety-one".