111217788881 has 2 divisors, whose sum is σ = 111217788882. Its totient is φ = 111217788880.

The previous prime is 111217788733. The next prime is 111217788917. The reversal of 111217788881 is 188887712111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87104668225 + 24113120656 = 295135^2 + 155284^2 .

It is a cyclic number.

It is not a de Polignac number, because 111217788881 - 2³⁴ = 94037919697 is a prime.

It is a super-2 number, since 2×111217788881² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111217788481) 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 as a sum of consecutive naturals, namely, 55608894440 + 55608894441.

It is an arithmetic number, because the mean of its divisors is an integer number (55608894441).

Almost surely, 2^111217788881 is an apocalyptic number.

It is an amenable number.

111217788881 is a deficient number, since it is larger than the sum of its proper divisors (1).

111217788881 is an equidigital number, since it uses as much as digits as its factorization.

111217788881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 401408, while the sum is 53.

The spelling of 111217788881 in words is "one hundred eleven billion, two hundred seventeen million, seven hundred eighty-eight thousand, eight hundred eighty-one".