111881111 has 2 divisors, whose sum is σ = 111881112. Its totient is φ = 111881110.

The previous prime is 111881071. The next prime is 111881113. The reversal of 111881111 is 111188111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111881111 - 2⁶ = 111881047 is a prime.

It is a Sophie Germain prime.

Together with 111881113, it forms a pair of twin primes.

It is a Chen prime.

It is a zygodrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111881113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55940555 + 55940556.

It is an arithmetic number, because the mean of its divisors is an integer number (55940556).

Almost surely, 2^111881111 is an apocalyptic number.

111881111 is a deficient number, since it is larger than the sum of its proper divisors (1).

111881111 is an equidigital number, since it uses as much as digits as its factorization.

111881111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64, while the sum is 23.

The square root of 111881111 is about 10577.3867755699. The cubic root of 111881111 is about 481.8578332806.

The spelling of 111881111 in words is "one hundred eleven million, eight hundred eighty-one thousand, one hundred eleven".