111011101109981 has 2 divisors, whose sum is σ = 111011101109982. Its totient is φ = 111011101109980.

The previous prime is 111011101109917. The next prime is 111011101110011. The reversal of 111011101109981 is 189901101110111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102311019941881 + 8700081168100 = 10114891^2 + 2949590^2 .

It is a cyclic number.

It is not a de Polignac number, because 111011101109981 - 2⁶ = 111011101109917 is a prime.

It is a super-2 number, since 2×111011101109981² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111011101169981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55505550554990 + 55505550554991.

It is an arithmetic number, because the mean of its divisors is an integer number (55505550554991).

Almost surely, 2^{111011101109981} is an apocalyptic number.

It is an amenable number.

111011101109981 is a deficient number, since it is larger than the sum of its proper divisors (1).

111011101109981 is an equidigital number, since it uses as much as digits as its factorization.

111011101109981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 35.

The spelling of 111011101109981 in words is "one hundred eleven trillion, eleven billion, one hundred one million, one hundred nine thousand, nine hundred eighty-one".