111103981 has 2 divisors, whose sum is σ = 111103982. Its totient is φ = 111103980.

The previous prime is 111103943. The next prime is 111103987. The reversal of 111103981 is 189301111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110565225 + 538756 = 10515^2 + 734^2 .

It is an emirp because it is prime and its reverse (189301111) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111103981 is a prime.

It is a super-2 number, since 2×111103981² = 24688189188096722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111103987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55551990 + 55551991.

It is an arithmetic number, because the mean of its divisors is an integer number (55551991).

Almost surely, 2^111103981 is an apocalyptic number.

It is an amenable number.

111103981 is a deficient number, since it is larger than the sum of its proper divisors (1).

111103981 is an equidigital number, since it uses as much as digits as its factorization.

111103981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 25.

The square root of 111103981 is about 10540.5873176024. The cubic root of 111103981 is about 480.7395731495.

The spelling of 111103981 in words is "one hundred eleven million, one hundred three thousand, nine hundred eighty-one".