85547221 has 4 divisors (see below), whose sum is σ = 85849792. Its totient is φ = 85244652.

The previous prime is 85547183. The next prime is 85547237. The reversal of 85547221 is 12274558.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12274558 = 2 ⋅6137279.

It is a cyclic number.

It is not a de Polignac number, because 85547221 - 2⁷ = 85547093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85547821) 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 3 ways as a sum of consecutive naturals, for example, 150861 + ... + 151426.

It is an arithmetic number, because the mean of its divisors is an integer number (21462448).

Almost surely, 2^85547221 is an apocalyptic number.

It is an amenable number.

85547221 is a deficient number, since it is larger than the sum of its proper divisors (302571).

85547221 is a wasteful number, since it uses less digits than its factorization.

85547221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302570.

The product of its digits is 22400, while the sum is 34.

The square root of 85547221 is about 9249.1740712347. The cubic root of 85547221 is about 440.6244937439.

The spelling of 85547221 in words is "eighty-five million, five hundred forty-seven thousand, two hundred twenty-one".