191921456842 has 8 divisors (see below), whose sum is σ = 294577119936. Its totient is φ = 93729083532.

The previous prime is 191921456767. The next prime is 191921456843. The reversal of 191921456842 is 248654129191.

191921456842 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×191921456842² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 191921456842.

It is not an unprimeable number, because it can be changed into a prime (191921456843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1115822338 + ... + 1115822509.

It is an arithmetic number, because the mean of its divisors is an integer number (36822139992).

Almost surely, 2^191921456842 is an apocalyptic number.

191921456842 is a deficient number, since it is larger than the sum of its proper divisors (102655663094).

191921456842 is a wasteful number, since it uses less digits than its factorization.

191921456842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2231644892.

The product of its digits is 1244160, while the sum is 52.

The spelling of 191921456842 in words is "one hundred ninety-one billion, nine hundred twenty-one million, four hundred fifty-six thousand, eight hundred forty-two".