111109991137 has 4 divisors (see below), whose sum is σ = 111253730580. Its totient is φ = 110966251696.

The previous prime is 111109991107. The next prime is 111109991143. The reversal of 111109991137 is 731199901111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23313930721 + 87796060416 = 152689^2 + 296304^2 .

It is a cyclic number.

It is not a de Polignac number, because 111109991137 - 2⁷ = 111109991009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111109991093 and 111109991102.

It is not an unprimeable number, because it can be changed into a prime (111109991107) 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 3 ways as a sum of consecutive naturals, for example, 71868562 + ... + 71870107.

It is an arithmetic number, because the mean of its divisors is an integer number (27813432645).

Almost surely, 2^111109991137 is an apocalyptic number.

It is an amenable number.

111109991137 is a deficient number, since it is larger than the sum of its proper divisors (143739443).

111109991137 is an equidigital number, since it uses as much as digits as its factorization.

111109991137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143739442.

The product of its (nonzero) digits is 15309, while the sum is 43.

The spelling of 111109991137 in words is "one hundred eleven billion, one hundred nine million, nine hundred ninety-one thousand, one hundred thirty-seven".