194498379991 has 2 divisors, whose sum is σ = 194498379992. Its totient is φ = 194498379990.

The previous prime is 194498379953. The next prime is 194498380057. The reversal of 194498379991 is 199973894491.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 194498379991 - 2⁷ = 194498379863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194498379931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97249189995 + 97249189996.

It is an arithmetic number, because the mean of its divisors is an integer number (97249189996).

Almost surely, 2^194498379991 is an apocalyptic number.

194498379991 is a deficient number, since it is larger than the sum of its proper divisors (1).

194498379991 is an equidigital number, since it uses as much as digits as its factorization.

194498379991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 158723712, while the sum is 73.

The spelling of 194498379991 in words is "one hundred ninety-four billion, four hundred ninety-eight million, three hundred seventy-nine thousand, nine hundred ninety-one".