85785523 has 2 divisors, whose sum is σ = 85785524. Its totient is φ = 85785522.

The previous prime is 85785521. The next prime is 85785533. The reversal of 85785523 is 32558758.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85785523 - 2¹ = 85785521 is a prime.

Together with 85785521, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 85785523.

It is not a weakly prime, because it can be changed into another prime (85785521) 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, 42892761 + 42892762.

It is an arithmetic number, because the mean of its divisors is an integer number (42892762).

Almost surely, 2^85785523 is an apocalyptic number.

85785523 is a deficient number, since it is larger than the sum of its proper divisors (1).

85785523 is an equidigital number, since it uses as much as digits as its factorization.

85785523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 336000, while the sum is 43.

The square root of 85785523 is about 9262.0474518327. The cubic root of 85785523 is about 441.0332518123.

The spelling of 85785523 in words is "eighty-five million, seven hundred eighty-five thousand, five hundred twenty-three".