85388521 has 4 divisors (see below), whose sum is σ = 85540752. Its totient is φ = 85236292.

The previous prime is 85388503. The next prime is 85388561. The reversal of 85388521 is 12588358.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 85388521 - 2⁷ = 85388393 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85388561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75271 + ... + 76396.

It is an arithmetic number, because the mean of its divisors is an integer number (21385188).

Almost surely, 2^85388521 is an apocalyptic number.

It is an amenable number.

85388521 is a deficient number, since it is larger than the sum of its proper divisors (152231).

85388521 is a wasteful number, since it uses less digits than its factorization.

85388521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152230.

The product of its digits is 76800, while the sum is 40.

The square root of 85388521 is about 9240.5909443065. The cubic root of 85388521 is about 440.3518552645.

The spelling of 85388521 in words is "eighty-five million, three hundred eighty-eight thousand, five hundred twenty-one".