85135823 has 2 divisors, whose sum is σ = 85135824. Its totient is φ = 85135822.

The previous prime is 85135807. The next prime is 85135871. The reversal of 85135823 is 32853158.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85135823 - 2⁴ = 85135807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85135873) 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, 42567911 + 42567912.

It is an arithmetic number, because the mean of its divisors is an integer number (42567912).

Almost surely, 2^85135823 is an apocalyptic number.

85135823 is a deficient number, since it is larger than the sum of its proper divisors (1).

85135823 is an equidigital number, since it uses as much as digits as its factorization.

85135823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 35.

The square root of 85135823 is about 9226.9075534547. The cubic root of 85135823 is about 439.9170349772.

It can be divided in two parts, 85135 and 823, that added together give a palindrome (85958).

The spelling of 85135823 in words is "eighty-five million, one hundred thirty-five thousand, eight hundred twenty-three".