84128111 has 2 divisors, whose sum is σ = 84128112. Its totient is φ = 84128110.

The previous prime is 84128071. The next prime is 84128123. The reversal of 84128111 is 11182148.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84128111 - 2¹⁸ = 83865967 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84128711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42064055 + 42064056.

It is an arithmetic number, because the mean of its divisors is an integer number (42064056).

Almost surely, 2^84128111 is an apocalyptic number.

84128111 is a deficient number, since it is larger than the sum of its proper divisors (1).

84128111 is an equidigital number, since it uses as much as digits as its factorization.

84128111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 512, while the sum is 26.

The square root of 84128111 is about 9172.1377551801. The cubic root of 84128111 is about 438.1744455704.

The spelling of 84128111 in words is "eighty-four million, one hundred twenty-eight thousand, one hundred eleven".