195842891 has 2 divisors, whose sum is σ = 195842892. Its totient is φ = 195842890.

The previous prime is 195842863. The next prime is 195842893. The reversal of 195842891 is 198248591.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 195842891 - 2⁶ = 195842827 is a prime.

Together with 195842893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (195842893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97921445 + 97921446.

It is an arithmetic number, because the mean of its divisors is an integer number (97921446).

Almost surely, 2^195842891 is an apocalyptic number.

195842891 is a deficient number, since it is larger than the sum of its proper divisors (1).

195842891 is an equidigital number, since it uses as much as digits as its factorization.

195842891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 47.

The square root of 195842891 is about 13994.3878394162. The cubic root of 195842891 is about 580.7233256575.

The spelling of 195842891 in words is "one hundred ninety-five million, eight hundred forty-two thousand, eight hundred ninety-one".