85128943 has 2 divisors, whose sum is σ = 85128944. Its totient is φ = 85128942.

The previous prime is 85128919. The next prime is 85128973. The reversal of 85128943 is 34982158.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85128943 - 2⁹ = 85128431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 85128896 and 85128905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85128913) 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, 42564471 + 42564472.

It is an arithmetic number, because the mean of its divisors is an integer number (42564472).

Almost surely, 2^85128943 is an apocalyptic number.

85128943 is a deficient number, since it is larger than the sum of its proper divisors (1).

85128943 is an equidigital number, since it uses as much as digits as its factorization.

85128943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 40.

The square root of 85128943 is about 9226.5347232859. The cubic root of 85128943 is about 439.9051844595.

The spelling of 85128943 in words is "eighty-five million, one hundred twenty-eight thousand, nine hundred forty-three".