86128589 has 2 divisors, whose sum is σ = 86128590. Its totient is φ = 86128588.

The previous prime is 86128573. The next prime is 86128631. The reversal of 86128589 is 98582168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85414564 + 714025 = 9242^2 + 845^2 .

It is a cyclic number.

It is not a de Polignac number, because 86128589 - 2⁴ = 86128573 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86128529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43064294 + 43064295.

It is an arithmetic number, because the mean of its divisors is an integer number (43064295).

Almost surely, 2^86128589 is an apocalyptic number.

It is an amenable number.

86128589 is a deficient number, since it is larger than the sum of its proper divisors (1).

86128589 is an equidigital number, since it uses as much as digits as its factorization.

86128589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 276480, while the sum is 47.

The square root of 86128589 is about 9280.5489600562. The cubic root of 86128589 is about 441.6203837740.

The spelling of 86128589 in words is "eighty-six million, one hundred twenty-eight thousand, five hundred eighty-nine".