194388189349 has 2 divisors, whose sum is σ = 194388189350. Its totient is φ = 194388189348.

The previous prime is 194388189337. The next prime is 194388189451. The reversal of 194388189349 is 943981883491.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188590432900 + 5797756449 = 434270^2 + 76143^2 .

It is a cyclic number.

It is not a de Polignac number, because 194388189349 - 2⁹ = 194388188837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194388189329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97194094674 + 97194094675.

It is an arithmetic number, because the mean of its divisors is an integer number (97194094675).

Almost surely, 2^194388189349 is an apocalyptic number.

It is an amenable number.

194388189349 is a deficient number, since it is larger than the sum of its proper divisors (1).

194388189349 is an equidigital number, since it uses as much as digits as its factorization.

194388189349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53747712, while the sum is 67.

The spelling of 194388189349 in words is "one hundred ninety-four billion, three hundred eighty-eight million, one hundred eighty-nine thousand, three hundred forty-nine".