85513521 has 16 divisors (see below), whose sum is σ = 116242560. Its totient is φ = 55902720.

The previous prime is 85513513. The next prime is 85513567. The reversal of 85513521 is 12531558.

It is not a de Polignac number, because 85513521 - 2³ = 85513513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85513511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91585 + ... + 92513.

It is an arithmetic number, because the mean of its divisors is an integer number (7265160).

Almost surely, 2^85513521 is an apocalyptic number.

It is an amenable number.

85513521 is a deficient number, since it is larger than the sum of its proper divisors (30729039).

85513521 is a wasteful number, since it uses less digits than its factorization.

85513521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1496.

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

The square root of 85513521 is about 9247.3521074954. The cubic root of 85513521 is about 440.5666270844.

The spelling of 85513521 in words is "eighty-five million, five hundred thirteen thousand, five hundred twenty-one".