194811871 has 2 divisors, whose sum is σ = 194811872. Its totient is φ = 194811870.

The previous prime is 194811853. The next prime is 194811889. The reversal of 194811871 is 178118491.

It is a balanced prime because it is at equal distance from previous prime (194811853) and next prime (194811889).

It is an emirp because it is prime and its reverse (178118491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 194811871 - 2⁵ = 194811839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194811811) 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, 97405935 + 97405936.

It is an arithmetic number, because the mean of its divisors is an integer number (97405936).

Almost surely, 2^194811871 is an apocalyptic number.

194811871 is a deficient number, since it is larger than the sum of its proper divisors (1).

194811871 is an equidigital number, since it uses as much as digits as its factorization.

194811871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 40.

The square root of 194811871 is about 13957.5023195413. The cubic root of 194811871 is about 579.7024543978.

The spelling of 194811871 in words is "one hundred ninety-four million, eight hundred eleven thousand, eight hundred seventy-one".