1991922191344 has 20 divisors (see below), whose sum is σ = 3859439968624. Its totient is φ = 995937683328.

The previous prime is 1991922191297. The next prime is 1991922191377. The reversal of 1991922191344 is 4431912291991.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 750852 + ... + 2132515.

Almost surely, 2^{1991922191344} is an apocalyptic number.

It is an amenable number.

1991922191344 is a deficient number, since it is larger than the sum of its proper divisors (1867517777280).

1991922191344 is a wasteful number, since it uses less digits than its factorization.

1991922191344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2926552 (or 2926546 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 55.

The spelling of 1991922191344 in words is "one trillion, nine hundred ninety-one billion, nine hundred twenty-two million, one hundred ninety-one thousand, three hundred forty-four".