111638887 has 2 divisors, whose sum is σ = 111638888. Its totient is φ = 111638886.

The previous prime is 111638873. The next prime is 111638897. The reversal of 111638887 is 788836111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111638887 - 2¹¹ = 111636839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111638837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55819443 + 55819444.

It is an arithmetic number, because the mean of its divisors is an integer number (55819444).

Almost surely, 2^111638887 is an apocalyptic number.

111638887 is a deficient number, since it is larger than the sum of its proper divisors (1).

111638887 is an equidigital number, since it uses as much as digits as its factorization.

111638887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 43.

The square root of 111638887 is about 10565.9304843445. The cubic root of 111638887 is about 481.5098392839.

The spelling of 111638887 in words is "one hundred eleven million, six hundred thirty-eight thousand, eight hundred eighty-seven".