111061009981 has 4 divisors (see below), whose sum is σ = 111358761052. Its totient is φ = 110763258912.

The previous prime is 111061009963. The next prime is 111061009993. The reversal of 111061009981 is 189900160111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 189900160111 = 19 ⋅9994745269.

It can be written as a sum of positive squares in 2 ways, for example, as 48077578756 + 62983431225 = 219266^2 + 250965^2 .

It is a cyclic number.

It is not a de Polignac number, because 111061009981 - 2¹⁵ = 111060977213 is a prime.

It is a super-2 number, since 2×111061009981² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111061009981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111061006981) 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 in 3 ways as a sum of consecutive naturals, for example, 148874976 + ... + 148875721.

It is an arithmetic number, because the mean of its divisors is an integer number (27839690263).

Almost surely, 2^111061009981 is an apocalyptic number.

It is an amenable number.

111061009981 is a deficient number, since it is larger than the sum of its proper divisors (297751071).

111061009981 is an equidigital number, since it uses as much as digits as its factorization.

111061009981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297751070.

The product of its (nonzero) digits is 3888, while the sum is 37.

The spelling of 111061009981 in words is "one hundred eleven billion, sixty-one million, nine thousand, nine hundred eighty-one".