194389919 has 2 divisors, whose sum is σ = 194389920. Its totient is φ = 194389918.

The previous prime is 194389889. The next prime is 194389927. The reversal of 194389919 is 919983491.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194389919 is a prime.

It is a super-2 number, since 2×194389919² = 75574881217653122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194389939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97194959 + 97194960.

It is an arithmetic number, because the mean of its divisors is an integer number (97194960).

Almost surely, 2^194389919 is an apocalyptic number.

194389919 is a deficient number, since it is larger than the sum of its proper divisors (1).

194389919 is an equidigital number, since it uses as much as digits as its factorization.

194389919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 629856, while the sum is 53.

The square root of 194389919 is about 13942.3785273532. The cubic root of 194389919 is about 579.2836171145.

The spelling of 194389919 in words is "one hundred ninety-four million, three hundred eighty-nine thousand, nine hundred nineteen".