194122075309 has 4 divisors (see below), whose sum is σ = 194596701820. Its totient is φ = 193647448800.

The previous prime is 194122075297. The next prime is 194122075391. The reversal of 194122075309 is 903570221491.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 169245846025 + 24876229284 = 411395^2 + 157722^2 .

It is a cyclic number.

It is not a de Polignac number, because 194122075309 - 2¹¹ = 194122073261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194122075009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237312642 + ... + 237313459.

It is an arithmetic number, because the mean of its divisors is an integer number (48649175455).

Almost surely, 2^194122075309 is an apocalyptic number.

It is an amenable number.

194122075309 is a deficient number, since it is larger than the sum of its proper divisors (474626511).

194122075309 is an equidigital number, since it uses as much as digits as its factorization.

194122075309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474626510.

The product of its (nonzero) digits is 136080, while the sum is 43.

The spelling of 194122075309 in words is "one hundred ninety-four billion, one hundred twenty-two million, seventy-five thousand, three hundred nine".