85823581 has 2 divisors, whose sum is σ = 85823582. Its totient is φ = 85823580.

The previous prime is 85823567. The next prime is 85823587. The reversal of 85823581 is 18532858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53436100 + 32387481 = 7310^2 + 5691^2 .

It is a cyclic number.

It is not a de Polignac number, because 85823581 - 2¹⁵ = 85790813 is a prime.

It is a super-2 number, since 2×85823581² = 14731374111327122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85823587) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42911790 + 42911791.

It is an arithmetic number, because the mean of its divisors is an integer number (42911791).

Almost surely, 2^85823581 is an apocalyptic number.

It is an amenable number.

85823581 is a deficient number, since it is larger than the sum of its proper divisors (1).

85823581 is an equidigital number, since it uses as much as digits as its factorization.

85823581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 76800, while the sum is 40.

The square root of 85823581 is about 9264.1017373515. The cubic root of 85823581 is about 441.0984623567.

The spelling of 85823581 in words is "eighty-five million, eight hundred twenty-three thousand, five hundred eighty-one".