85186521 has 12 divisors (see below), whose sum is σ = 140625472. Its totient is φ = 48677976.

The previous prime is 85186447. The next prime is 85186537. The reversal of 85186521 is 12568158.

85186521 is a `hidden beast` number, since 8 + 51 + 86 + 521 = 666.

It is not a de Polignac number, because 85186521 - 2⁹ = 85186009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (85186121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 676021 + ... + 676146.

Almost surely, 2^85186521 is an apocalyptic number.

It is an amenable number.

85186521 is a deficient number, since it is larger than the sum of its proper divisors (55438951).

85186521 is a wasteful number, since it uses less digits than its factorization.

85186521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1352180 (or 1352177 counting only the distinct ones).

The product of its digits is 19200, while the sum is 36.

The square root of 85186521 is about 9229.6544355680. The cubic root of 85186521 is about 440.0043405219.

The spelling of 85186521 in words is "eighty-five million, one hundred eighty-six thousand, five hundred twenty-one".