111839720109 has 16 divisors (see below), whose sum is σ = 160905897600. Its totient is φ = 68689215936.

The previous prime is 111839720077. The next prime is 111839720119. The reversal of 111839720109 is 901027938111.

It is not a de Polignac number, because 111839720109 - 2⁵ = 111839720077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111839720119) 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, 2797129 + ... + 2836830.

It is an arithmetic number, because the mean of its divisors is an integer number (10056618600).

Almost surely, 2^111839720109 is an apocalyptic number.

It is an amenable number.

111839720109 is a deficient number, since it is larger than the sum of its proper divisors (49066177491).

111839720109 is a wasteful number, since it uses less digits than its factorization.

111839720109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5634484.

The product of its (nonzero) digits is 27216, while the sum is 42.

The spelling of 111839720109 in words is "one hundred eleven billion, eight hundred thirty-nine million, seven hundred twenty thousand, one hundred nine".