86987221 has 4 divisors (see below), whose sum is σ = 87037792. Its totient is φ = 86936652.

The previous prime is 86987213. The next prime is 86987261. The reversal of 86987221 is 12278968.

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 86987221 - 2³ = 86987213 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 (86987261) 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, 22611 + ... + 26176.

It is an arithmetic number, because the mean of its divisors is an integer number (21759448).

Almost surely, 2^86987221 is an apocalyptic number.

It is an amenable number.

86987221 is a deficient number, since it is larger than the sum of its proper divisors (50571).

86987221 is a wasteful number, since it uses less digits than its factorization.

86987221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50570.

The product of its digits is 96768, while the sum is 43.

The square root of 86987221 is about 9326.6940016278. The cubic root of 86987221 is about 443.0830659509.

The spelling of 86987221 in words is "eighty-six million, nine hundred eighty-seven thousand, two hundred twenty-one".