194497133 has 2 divisors, whose sum is σ = 194497134. Its totient is φ = 194497132.

The previous prime is 194497111. The next prime is 194497151. The reversal of 194497133 is 331794491.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191462569 + 3034564 = 13837^2 + 1742^2 .

It is a cyclic number.

It is not a de Polignac number, because 194497133 - 2⁸ = 194496877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194497183) 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, 97248566 + 97248567.

It is an arithmetic number, because the mean of its divisors is an integer number (97248567).

Almost surely, 2^194497133 is an apocalyptic number.

It is an amenable number.

194497133 is a deficient number, since it is larger than the sum of its proper divisors (1).

194497133 is an equidigital number, since it uses as much as digits as its factorization.

194497133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 41.

The square root of 194497133 is about 13946.2228936727. Note that the first 3 decimals coincide. The cubic root of 194497133 is about 579.3900970858.

The spelling of 194497133 in words is "one hundred ninety-four million, four hundred ninety-seven thousand, one hundred thirty-three".