191981347108 has 12 divisors (see below), whose sum is σ = 347552438940. Its totient is φ = 92680650272.

The previous prime is 191981347069. The next prime is 191981347127. The reversal of 191981347108 is 801743189191.

It is a happy number.

191981347108 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 104437556224 + 87543790884 = 323168^2 + 295878^2 .

It is an unprimeable number.

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, 827505691 + ... + 827505922.

It is an arithmetic number, because the mean of its divisors is an integer number (28962703245).

Almost surely, 2^191981347108 is an apocalyptic number.

It is an amenable number.

191981347108 is a deficient number, since it is larger than the sum of its proper divisors (155571091832).

191981347108 is a wasteful number, since it uses less digits than its factorization.

191981347108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1655011646 (or 1655011644 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 52.

The spelling of 191981347108 in words is "one hundred ninety-one billion, nine hundred eighty-one million, three hundred forty-seven thousand, one hundred eight".