87163321 has 4 divisors (see below), whose sum is σ = 99615232. Its totient is φ = 74711412.

The previous prime is 87163273. The next prime is 87163331. The reversal of 87163321 is 12336178.

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: 12336178 = 2 ⋅6168089.

It is a cyclic number.

It is not a de Polignac number, because 87163321 - 2¹¹ = 87161273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87163331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6225945 + ... + 6225958.

It is an arithmetic number, because the mean of its divisors is an integer number (24903808).

Almost surely, 2^87163321 is an apocalyptic number.

It is an amenable number.

87163321 is a deficient number, since it is larger than the sum of its proper divisors (12451911).

87163321 is a wasteful number, since it uses less digits than its factorization.

87163321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12451910.

The product of its digits is 6048, while the sum is 31.

The square root of 87163321 is about 9336.1298727042. The cubic root of 87163321 is about 443.3818620755.

Adding to 87163321 its reverse (12336178), we get a palindrome (99499499).

The spelling of 87163321 in words is "eighty-seven million, one hundred sixty-three thousand, three hundred twenty-one".