194244988909 has 2 divisors, whose sum is σ = 194244988910. Its totient is φ = 194244988908.

The previous prime is 194244988897. The next prime is 194244989011. The reversal of 194244988909 is 909889442491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120832712100 + 73412276809 = 347610^2 + 270947^2 .

It is a cyclic number.

It is not a de Polignac number, because 194244988909 - 2⁷ = 194244988781 is a prime.

It is a super-2 number, since 2×194244988909² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194244988309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97122494454 + 97122494455.

It is an arithmetic number, because the mean of its divisors is an integer number (97122494455).

Almost surely, 2^194244988909 is an apocalyptic number.

It is an amenable number.

194244988909 is a deficient number, since it is larger than the sum of its proper divisors (1).

194244988909 is an equidigital number, since it uses as much as digits as its factorization.

194244988909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 53747712, while the sum is 67.

The spelling of 194244988909 in words is "one hundred ninety-four billion, two hundred forty-four million, nine hundred eighty-eight thousand, nine hundred nine".