111011110981 has 2 divisors, whose sum is σ = 111011110982. Its totient is φ = 111011110980.

The previous prime is 111011110979. The next prime is 111011110999. The reversal of 111011110981 is 189011110111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80389260900 + 30621850081 = 283530^2 + 174991^2 .

It is a cyclic number.

It is not a de Polignac number, because 111011110981 - 2¹ = 111011110979 is a prime.

It is a super-2 number, since 2×111011110981² (a number of 23 digits) contains 22 as substring.

Together with 111011110979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111011110901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55505555490 + 55505555491.

It is an arithmetic number, because the mean of its divisors is an integer number (55505555491).

Almost surely, 2^111011110981 is an apocalyptic number.

It is an amenable number.

111011110981 is a deficient number, since it is larger than the sum of its proper divisors (1).

111011110981 is an equidigital number, since it uses as much as digits as its factorization.

111011110981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 25.

The spelling of 111011110981 in words is "one hundred eleven billion, eleven million, one hundred ten thousand, nine hundred eighty-one".