191694391313 has 4 divisors (see below), whose sum is σ = 191723650788. Its totient is φ = 191665131840.

The previous prime is 191694391303. The next prime is 191694391321. The reversal of 191694391313 is 313193496191.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 313193496191 = 367 ⋅853388273.

It can be written as a sum of positive squares in 2 ways, for example, as 137632096144 + 54062295169 = 370988^2 + 232513^2 .

It is a cyclic number.

It is not a de Polignac number, because 191694391313 - 2⁴ = 191694391297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191694391303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14619908 + ... + 14633013.

It is an arithmetic number, because the mean of its divisors is an integer number (47930912697).

Almost surely, 2^191694391313 is an apocalyptic number.

It is an amenable number.

191694391313 is a deficient number, since it is larger than the sum of its proper divisors (29259475).

191694391313 is an equidigital number, since it uses as much as digits as its factorization.

191694391313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29259474.

The product of its digits is 472392, while the sum is 50.

The spelling of 191694391313 in words is "one hundred ninety-one billion, six hundred ninety-four million, three hundred ninety-one thousand, three hundred thirteen".