86128139 has 2 divisors, whose sum is σ = 86128140. Its totient is φ = 86128138.

The previous prime is 86128099. The next prime is 86128181. The reversal of 86128139 is 93182168.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86128139 is a prime.

It is not a weakly prime, because it can be changed into another prime (86122139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43064069 + 43064070.

It is an arithmetic number, because the mean of its divisors is an integer number (43064070).

Almost surely, 2^86128139 is an apocalyptic number.

86128139 is a deficient number, since it is larger than the sum of its proper divisors (1).

86128139 is an equidigital number, since it uses as much as digits as its factorization.

86128139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 38.

The square root of 86128139 is about 9280.5247157690. The cubic root of 86128139 is about 441.6196146545.

The spelling of 86128139 in words is "eighty-six million, one hundred twenty-eight thousand, one hundred thirty-nine".