85985791 has 2 divisors, whose sum is σ = 85985792. Its totient is φ = 85985790.

The previous prime is 85985771. The next prime is 85985797. The reversal of 85985791 is 19758958.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85985791 - 2¹¹ = 85983743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85985797) 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, 42992895 + 42992896.

It is an arithmetic number, because the mean of its divisors is an integer number (42992896).

Almost surely, 2^85985791 is an apocalyptic number.

85985791 is a deficient number, since it is larger than the sum of its proper divisors (1).

85985791 is an equidigital number, since it uses as much as digits as its factorization.

85985791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 907200, while the sum is 52.

The square root of 85985791 is about 9272.8523659120. The cubic root of 85985791 is about 441.3761853717.

The spelling of 85985791 in words is "eighty-five million, nine hundred eighty-five thousand, seven hundred ninety-one".