191972213601884 has 24 divisors (see below), whose sum is σ = 355737596766048. Its totient is φ = 90333674127360.

The previous prime is 191972213601851. The next prime is 191972213601887. The reversal of 191972213601884 is 488106312279191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191972213601887) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 95736272 + ... + 97720919.

It is an arithmetic number, because the mean of its divisors is an integer number (14822399865252).

Almost surely, 2^{191972213601884} is an apocalyptic number.

It is an amenable number.

191972213601884 is a deficient number, since it is larger than the sum of its proper divisors (163765383164164).

191972213601884 is a wasteful number, since it uses less digits than its factorization.

191972213601884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193471805 (or 193471803 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 62.

The spelling of 191972213601884 in words is "one hundred ninety-one trillion, nine hundred seventy-two billion, two hundred thirteen million, six hundred one thousand, eight hundred eighty-four".