111000111100981 has 2 divisors, whose sum is σ = 111000111100982. Its totient is φ = 111000111100980.

The previous prime is 111000111100961. The next prime is 111000111100987. The reversal of 111000111100981 is 189001111000111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67305763672081 + 43694347428900 = 8204009^2 + 6610170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111000111100981 is a prime.

It is a super-2 number, since 2×111000111100981² (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 (111000111100987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55500055550490 + 55500055550491.

It is an arithmetic number, because the mean of its divisors is an integer number (55500055550491).

Almost surely, 2^{111000111100981} is an apocalyptic number.

It is an amenable number.

111000111100981 is a deficient number, since it is larger than the sum of its proper divisors (1).

111000111100981 is an equidigital number, since it uses as much as digits as its factorization.

111000111100981 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 111000111100981 in words is "one hundred eleven trillion, one hundred eleven million, one hundred thousand, nine hundred eighty-one".