194781800109 has 32 divisors (see below), whose sum is σ = 281165592960. Its totient is φ = 119233216512.

The previous prime is 194781800071. The next prime is 194781800173. The reversal of 194781800109 is 901008187491.

It is not a de Polignac number, because 194781800109 - 2⁷ = 194781799981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194781800209) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7393849 + ... + 7420145.

It is an arithmetic number, because the mean of its divisors is an integer number (8786424780).

Almost surely, 2^194781800109 is an apocalyptic number.

It is an amenable number.

194781800109 is a deficient number, since it is larger than the sum of its proper divisors (86383792851).

194781800109 is a wasteful number, since it uses less digits than its factorization.

194781800109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27309.

The product of its (nonzero) digits is 145152, while the sum is 48.

The spelling of 194781800109 in words is "one hundred ninety-four billion, seven hundred eighty-one million, eight hundred thousand, one hundred nine".