128006111 has 2 divisors, whose sum is σ = 128006112. Its totient is φ = 128006110.

The previous prime is 128006093. The next prime is 128006143. The reversal of 128006111 is 111600821.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128006111 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128006611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64003055 + 64003056.

It is an arithmetic number, because the mean of its divisors is an integer number (64003056).

Almost surely, 2^128006111 is an apocalyptic number.

128006111 is a deficient number, since it is larger than the sum of its proper divisors (1).

128006111 is an equidigital number, since it uses as much as digits as its factorization.

128006111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 20.

The square root of 128006111 is about 11313.9785663576. The cubic root of 128006111 is about 503.9764400153.

Adding to 128006111 its reverse (111600821), we get a palindrome (239606932).

The spelling of 128006111 in words is "one hundred twenty-eight million, six thousand, one hundred eleven".