111011111001881 has 2 divisors, whose sum is σ = 111011111001882. Its totient is φ = 111011111001880.

The previous prime is 111011111001877. The next prime is 111011111001893. The reversal of 111011111001881 is 188100111110111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87716636192656 + 23294474809225 = 9365716^2 + 4826435^2 .

It is a cyclic number.

It is not a de Polignac number, because 111011111001881 - 2² = 111011111001877 is a prime.

It is a super-2 number, since 2×111011111001881² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 111011111001881.

It is not a weakly prime, because it can be changed into another prime (111011111001821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55505555500940 + 55505555500941.

It is an arithmetic number, because the mean of its divisors is an integer number (55505555500941).

Almost surely, 2^{111011111001881} is an apocalyptic number.

It is an amenable number.

111011111001881 is a deficient number, since it is larger than the sum of its proper divisors (1).

111011111001881 is an equidigital number, since it uses as much as digits as its factorization.

111011111001881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 26.

Adding to 111011111001881 its reverse (188100111110111), we get a palindrome (299111222111992).

The spelling of 111011111001881 in words is "one hundred eleven trillion, eleven billion, one hundred eleven million, one thousand, eight hundred eighty-one".