194549993219 has 2 divisors, whose sum is σ = 194549993220. Its totient is φ = 194549993218.

The previous prime is 194549993189. The next prime is 194549993269. The reversal of 194549993219 is 912399945491.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194549993219 is a prime.

It is a super-2 number, since 2×194549993219² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (194549993269) 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, 97274996609 + 97274996610.

It is an arithmetic number, because the mean of its divisors is an integer number (97274996610).

Almost surely, 2^194549993219 is an apocalyptic number.

194549993219 is a deficient number, since it is larger than the sum of its proper divisors (1).

194549993219 is an equidigital number, since it uses as much as digits as its factorization.

194549993219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28343520, while the sum is 65.

The spelling of 194549993219 in words is "one hundred ninety-four billion, five hundred forty-nine million, nine hundred ninety-three thousand, two hundred nineteen".