111938861 has 16 divisors (see below), whose sum is σ = 126935040. Its totient is φ = 98152560.

The previous prime is 111938839. The next prime is 111938887. The reversal of 111938861 is 168839111.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111938861 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111938821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9416 + ... + 17678.

It is an arithmetic number, because the mean of its divisors is an integer number (7933440).

Almost surely, 2^111938861 is an apocalyptic number.

It is an amenable number.

111938861 is a deficient number, since it is larger than the sum of its proper divisors (14996179).

111938861 is a wasteful number, since it uses less digits than its factorization.

111938861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8336.

The product of its digits is 10368, while the sum is 38.

The square root of 111938861 is about 10580.1163037086. The cubic root of 111938861 is about 481.9407263418.

The spelling of 111938861 in words is "one hundred eleven million, nine hundred thirty-eight thousand, eight hundred sixty-one".