195844091 has 2 divisors, whose sum is σ = 195844092. Its totient is φ = 195844090.

The previous prime is 195844087. The next prime is 195844109. The reversal of 195844091 is 190448591.

Together with next prime (195844109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 195844091 - 2² = 195844087 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (195844021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97922045 + 97922046.

It is an arithmetic number, because the mean of its divisors is an integer number (97922046).

Almost surely, 2^195844091 is an apocalyptic number.

195844091 is a deficient number, since it is larger than the sum of its proper divisors (1).

195844091 is an equidigital number, since it uses as much as digits as its factorization.

195844091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 195844091 is about 13994.4307136804. The cubic root of 195844091 is about 580.7245117555.

The spelling of 195844091 in words is "one hundred ninety-five million, eight hundred forty-four thousand, ninety-one".