86547221 has 4 divisors (see below), whose sum is σ = 91638252. Its totient is φ = 81456192.

The previous prime is 86547211. The next prime is 86547239. The reversal of 86547221 is 12274568.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 75082225 + 11464996 = 8665^2 + 3386^2 .

It is a cyclic number.

It is not a de Polignac number, because 86547221 - 2¹⁸ = 86285077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86547211) 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, 2545490 + ... + 2545523.

It is an arithmetic number, because the mean of its divisors is an integer number (22909563).

Almost surely, 2^86547221 is an apocalyptic number.

It is an amenable number.

86547221 is a deficient number, since it is larger than the sum of its proper divisors (5091031).

86547221 is a wasteful number, since it uses less digits than its factorization.

86547221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5091030.

The product of its digits is 26880, while the sum is 35.

The square root of 86547221 is about 9303.0758891885. The cubic root of 86547221 is about 442.3347330951.

It can be divided in two parts, 86547 and 221, that added together give a palindrome (86768).

The spelling of 86547221 in words is "eighty-six million, five hundred forty-seven thousand, two hundred twenty-one".