111739861 has 16 divisors (see below), whose sum is σ = 120996720. Its totient is φ = 102804480.

The previous prime is 111739811. The next prime is 111739879. The reversal of 111739861 is 168937111.

It can be written as a sum of positive squares in 8 ways, for example, as 23097636 + 88642225 = 4806^2 + 9415^2 .

It is a cyclic number.

It is not a de Polignac number, because 111739861 - 2¹⁷ = 111608789 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111739861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111739811) 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, 287055 + ... + 287443.

It is an arithmetic number, because the mean of its divisors is an integer number (7562295).

Almost surely, 2^111739861 is an apocalyptic number.

It is an amenable number.

111739861 is a deficient number, since it is larger than the sum of its proper divisors (9256859).

111739861 is a wasteful number, since it uses less digits than its factorization.

111739861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744.

The product of its digits is 9072, while the sum is 37.

The square root of 111739861 is about 10570.7076868108. The cubic root of 111739861 is about 481.6549659052.

The spelling of 111739861 in words is "one hundred eleven million, seven hundred thirty-nine thousand, eight hundred sixty-one".