194743042209 has 15 divisors (see below), whose sum is σ = 290918378883. Its totient is φ = 129826047024.

The previous prime is 194743042163. The next prime is 194743042217. The reversal of 194743042209 is 902240347491.

The square root of 194743042209 is 441297.

It is a perfect power (a square), and thus also a powerful number.

194743042209 is a `hidden beast` number, since 1 + 9 + 4 + 7 + 430 + 4 + 2 + 209 = 666.

It can be written as a sum of positive squares in only one way, i.e., 37984061025 + 156758981184 = 194895^2 + 395928^2 .

It is not a de Polignac number, because 194743042209 - 2²¹ = 194740945057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (194743041209) 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 in 14 ways as a sum of consecutive naturals, for example, 3947157 + ... + 3996189.

Almost surely, 2^194743042209 is an apocalyptic number.

194743042209 is the 441297-th square number.

194743042209 is the 220649-th centered octagonal number.

It is an amenable number.

194743042209 is a deficient number, since it is larger than the sum of its proper divisors (96175336674).

194743042209 is an frugal number, since it uses more digits than its factorization.

194743042209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98078 (or 49036 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The spelling of 194743042209 in words is "one hundred ninety-four billion, seven hundred forty-three million, forty-two thousand, two hundred nine".