111810641 has 4 divisors (see below), whose sum is σ = 111997284. Its totient is φ = 111624000.

The previous prime is 111810637. The next prime is 111810661. The reversal of 111810641 is 146018111.

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 60902416 + 50908225 = 7804^2 + 7135^2 .

It is a cyclic number.

It is not a de Polignac number, because 111810641 - 2² = 111810637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111810661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92420 + ... + 93621.

It is an arithmetic number, because the mean of its divisors is an integer number (27999321).

Almost surely, 2^111810641 is an apocalyptic number.

It is an amenable number.

111810641 is a deficient number, since it is larger than the sum of its proper divisors (186643).

111810641 is an equidigital number, since it uses as much as digits as its factorization.

111810641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186642.

The product of its (nonzero) digits is 192, while the sum is 23.

The square root of 111810641 is about 10574.0550878081. The cubic root of 111810641 is about 481.7566435651.

Adding to 111810641 its reverse (146018111), we get a palindrome (257828752).

The spelling of 111810641 in words is "one hundred eleven million, eight hundred ten thousand, six hundred forty-one".