85521513 has 24 divisors (see below), whose sum is σ = 144707040. Its totient is φ = 44425920.

The previous prime is 85521497. The next prime is 85521563. The reversal of 85521513 is 31512558.

It is not a de Polignac number, because 85521513 - 2⁴ = 85521497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85521563) 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, 24828 + ... + 28061.

It is an arithmetic number, because the mean of its divisors is an integer number (6029460).

Almost surely, 2^85521513 is an apocalyptic number.

It is an amenable number.

85521513 is a deficient number, since it is larger than the sum of its proper divisors (59185527).

85521513 is a wasteful number, since it uses less digits than its factorization.

85521513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52917 (or 52910 counting only the distinct ones).

The product of its digits is 6000, while the sum is 30.

The square root of 85521513 is about 9247.7842210986. The cubic root of 85521513 is about 440.5803516150.

The spelling of 85521513 in words is "eighty-five million, five hundred twenty-one thousand, five hundred thirteen".