191820729423 has 16 divisors (see below), whose sum is σ = 270830891520. Its totient is φ = 120346924416.

The previous prime is 191820729403. The next prime is 191820729431. The reversal of 191820729423 is 324927028191.

It is not a de Polignac number, because 191820729423 - 2¹⁷ = 191820598351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191820729403) 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 15 ways as a sum of consecutive naturals, for example, 397936 + ... + 736202.

It is an arithmetic number, because the mean of its divisors is an integer number (16926930720).

Almost surely, 2^191820729423 is an apocalyptic number.

191820729423 is a deficient number, since it is larger than the sum of its proper divisors (79010162097).

191820729423 is a wasteful number, since it uses less digits than its factorization.

191820729423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349406.

The product of its (nonzero) digits is 435456, while the sum is 48.

The spelling of 191820729423 in words is "one hundred ninety-one billion, eight hundred twenty million, seven hundred twenty-nine thousand, four hundred twenty-three".