85844069 has 2 divisors, whose sum is σ = 85844070. Its totient is φ = 85844068.

The previous prime is 85844029. The next prime is 85844081. The reversal of 85844069 is 96044858.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85840225 + 3844 = 9265^2 + 62^2 .

It is a cyclic number.

It is not a de Polignac number, because 85844069 - 2¹² = 85839973 is a prime.

It is a super-2 number, since 2×85844069² = 14738408364953522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85844009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42922034 + 42922035.

It is an arithmetic number, because the mean of its divisors is an integer number (42922035).

Almost surely, 2^85844069 is an apocalyptic number.

It is an amenable number.

85844069 is a deficient number, since it is larger than the sum of its proper divisors (1).

85844069 is an equidigital number, since it uses as much as digits as its factorization.

85844069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 276480, while the sum is 44.

The square root of 85844069 is about 9265.2074450603. The cubic root of 85844069 is about 441.1335595726.

The spelling of 85844069 in words is "eighty-five million, eight hundred forty-four thousand, sixty-nine".