85855807 has 2 divisors, whose sum is σ = 85855808. Its totient is φ = 85855806.

The previous prime is 85855789. The next prime is 85855843. The reversal of 85855807 is 70855858.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85855807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85055807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42927903 + 42927904.

It is an arithmetic number, because the mean of its divisors is an integer number (42927904).

Almost surely, 2^85855807 is an apocalyptic number.

85855807 is a deficient number, since it is larger than the sum of its proper divisors (1).

85855807 is an equidigital number, since it uses as much as digits as its factorization.

85855807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448000, while the sum is 46.

The square root of 85855807 is about 9265.8408684803. The cubic root of 85855807 is about 441.1536649792.

It can be divided in two parts, 858 and 55807, that added together give a palindrome (56665).

The spelling of 85855807 in words is "eighty-five million, eight hundred fifty-five thousand, eight hundred seven".