111085861 has 4 divisors (see below), whose sum is σ = 111141324. Its totient is φ = 111030400.

The previous prime is 111085859. The next prime is 111085867. The reversal of 111085861 is 168580111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 168580111 = 7 ⋅24082873.

It can be written as a sum of positive squares in 2 ways, for example, as 27363361 + 83722500 = 5231^2 + 9150^2 .

It is a cyclic number.

It is not a de Polignac number, because 111085861 - 2¹ = 111085859 is a prime.

It is a super-2 number, since 2×111085861² = 24680137028222642, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) 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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (111085867) 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 3 ways as a sum of consecutive naturals, for example, 24610 + ... + 28771.

It is an arithmetic number, because the mean of its divisors is an integer number (27785331).

Almost surely, 2^111085861 is an apocalyptic number.

It is an amenable number.

111085861 is a deficient number, since it is larger than the sum of its proper divisors (55463).

111085861 is an equidigital number, since it uses as much as digits as its factorization.

111085861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55462.

The product of its (nonzero) digits is 1920, while the sum is 31.

The square root of 111085861 is about 10539.7277479070. The cubic root of 111085861 is about 480.7134370483.

The spelling of 111085861 in words is "one hundred eleven million, eighty-five thousand, eight hundred sixty-one".