85641523 has 4 divisors (see below), whose sum is σ = 93427128. Its totient is φ = 77855920.

The previous prime is 85641511. The next prime is 85641527. The reversal of 85641523 is 32514658.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 85641523 - 2²¹ = 83544371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85641527) 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 in 3 ways as a sum of consecutive naturals, for example, 3892786 + ... + 3892807.

It is an arithmetic number, because the mean of its divisors is an integer number (23356782).

Almost surely, 2^85641523 is an apocalyptic number.

85641523 is a deficient number, since it is larger than the sum of its proper divisors (7785605).

85641523 is a wasteful number, since it uses less digits than its factorization.

85641523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7785604.

The product of its digits is 28800, while the sum is 34.

The square root of 85641523 is about 9254.2705277077. The cubic root of 85641523 is about 440.7863400779.

The spelling of 85641523 in words is "eighty-five million, six hundred forty-one thousand, five hundred twenty-three".