194423096209 has 2 divisors, whose sum is σ = 194423096210. Its totient is φ = 194423096208.

The previous prime is 194423096143. The next prime is 194423096261. The reversal of 194423096209 is 902690324491.

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., 108354205584 + 86068890625 = 329172^2 + 293375^2 .

It is an emirp because it is prime and its reverse (902690324491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 194423096209 - 2¹⁷ = 194422965137 is a prime.

It is not a weakly prime, because it can be changed into another prime (194423096509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97211548104 + 97211548105.

It is an arithmetic number, because the mean of its divisors is an integer number (97211548105).

Almost surely, 2^194423096209 is an apocalyptic number.

It is an amenable number.

194423096209 is a deficient number, since it is larger than the sum of its proper divisors (1).

194423096209 is an equidigital number, since it uses as much as digits as its factorization.

194423096209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 839808, while the sum is 49.

The spelling of 194423096209 in words is "one hundred ninety-four billion, four hundred twenty-three million, ninety-six thousand, two hundred nine".