87109321 has 4 divisors (see below), whose sum is σ = 93810052. Its totient is φ = 80408592.

The previous prime is 87109291. The next prime is 87109339. The reversal of 87109321 is 12390178.

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 44023225 + 43086096 = 6635^2 + 6564^2 .

It is a cyclic number.

It is not a de Polignac number, because 87109321 - 2⁵ = 87109289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87109391) 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, 3350346 + ... + 3350371.

It is an arithmetic number, because the mean of its divisors is an integer number (23452513).

Almost surely, 2^87109321 is an apocalyptic number.

It is an amenable number.

87109321 is a deficient number, since it is larger than the sum of its proper divisors (6700731).

87109321 is a wasteful number, since it uses less digits than its factorization.

87109321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6700730.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 87109321 is about 9333.2374340311. The cubic root of 87109321 is about 443.2902808677.

Adding to 87109321 its reverse (12390178), we get a palindrome (99499499).

The spelling of 87109321 in words is "eighty-seven million, one hundred nine thousand, three hundred twenty-one".