87281321 has 4 divisors (see below), whose sum is σ = 88262100. Its totient is φ = 86300544.

The previous prime is 87281287. The next prime is 87281323. The reversal of 87281321 is 12318278.

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 52765696 + 34515625 = 7264^2 + 5875^2 .

It is a cyclic number.

It is not a de Polignac number, because 87281321 - 2¹⁴ = 87264937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87281323) 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, 490256 + ... + 490433.

It is an arithmetic number, because the mean of its divisors is an integer number (22065525).

Almost surely, 2^87281321 is an apocalyptic number.

It is an amenable number.

87281321 is a deficient number, since it is larger than the sum of its proper divisors (980779).

87281321 is an equidigital number, since it uses as much as digits as its factorization.

87281321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980778.

The product of its digits is 5376, while the sum is 32.

The square root of 87281321 is about 9342.4472703891. The cubic root of 87281321 is about 443.5818524206.

Adding to 87281321 its reverse (12318278), we get a palindrome (99599599).

The spelling of 87281321 in words is "eighty-seven million, two hundred eighty-one thousand, three hundred twenty-one".