195170891 has 2 divisors, whose sum is σ = 195170892. Its totient is φ = 195170890.

The previous prime is 195170803. The next prime is 195170909. The reversal of 195170891 is 198071591.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 195170891 - 2¹⁰ = 195169867 is a prime.

It is not a weakly prime, because it can be changed into another prime (195170191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97585445 + 97585446.

It is an arithmetic number, because the mean of its divisors is an integer number (97585446).

Almost surely, 2^195170891 is an apocalyptic number.

195170891 is a deficient number, since it is larger than the sum of its proper divisors (1).

195170891 is an equidigital number, since it uses as much as digits as its factorization.

195170891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 41.

The square root of 195170891 is about 13970.3575831115. The cubic root of 195170891 is about 580.0583482718.

The spelling of 195170891 in words is "one hundred ninety-five million, one hundred seventy thousand, eight hundred ninety-one".