85631535 has 24 divisors (see below), whose sum is σ = 161922384. Its totient is φ = 41518080.

The previous prime is 85631531. The next prime is 85631543. The reversal of 85631535 is 53513658.

It is not a de Polignac number, because 85631535 - 2² = 85631531 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85631535.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85631531) 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 23 ways as a sum of consecutive naturals, for example, 86002 + ... + 86991.

It is an arithmetic number, because the mean of its divisors is an integer number (6746766).

Almost surely, 2^85631535 is an apocalyptic number.

85631535 is a deficient number, since it is larger than the sum of its proper divisors (76290849).

85631535 is a wasteful number, since it uses less digits than its factorization.

85631535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173015 (or 173012 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 85631535 is about 9253.7308692224. The cubic root of 85631535 is about 440.7692037443.

The spelling of 85631535 in words is "eighty-five million, six hundred thirty-one thousand, five hundred thirty-five".