85865239 has 2 divisors, whose sum is σ = 85865240. Its totient is φ = 85865238.

The previous prime is 85865209. The next prime is 85865293. The reversal of 85865239 is 93256858.

Together with next prime (85865293) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85865239 - 2⁵ = 85865207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85865209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42932619 + 42932620.

It is an arithmetic number, because the mean of its divisors is an integer number (42932620).

Almost surely, 2^85865239 is an apocalyptic number.

85865239 is a deficient number, since it is larger than the sum of its proper divisors (1).

85865239 is an equidigital number, since it uses as much as digits as its factorization.

85865239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518400, while the sum is 46.

The square root of 85865239 is about 9266.3498207223. The cubic root of 85865239 is about 441.1698192311.

The spelling of 85865239 in words is "eighty-five million, eight hundred sixty-five thousand, two hundred thirty-nine".