111981602041 has 4 divisors (see below), whose sum is σ = 112470604900. Its totient is φ = 111492599184.

The previous prime is 111981602039. The next prime is 111981602053. The reversal of 111981602041 is 140206189111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 140206189111 = 103 ⋅1361225137.

It can be written as a sum of positive squares in 2 ways, for example, as 108650003641 + 3331598400 = 329621^2 + 57720^2 .

It is a cyclic number.

It is not a de Polignac number, because 111981602041 - 2¹ = 111981602039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111981601988 and 111981602006.

It is not an unprimeable number, because it can be changed into a prime (111981602021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244501086 + ... + 244501543.

It is an arithmetic number, because the mean of its divisors is an integer number (28117651225).

Almost surely, 2^111981602041 is an apocalyptic number.

It is an amenable number.

111981602041 is a deficient number, since it is larger than the sum of its proper divisors (489002859).

111981602041 is an equidigital number, since it uses as much as digits as its factorization.

111981602041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489002858.

The product of its (nonzero) digits is 3456, while the sum is 34.

The spelling of 111981602041 in words is "one hundred eleven billion, nine hundred eighty-one million, six hundred two thousand, forty-one".