87480221 has 2 divisors, whose sum is σ = 87480222. Its totient is φ = 87480220.

The previous prime is 87480203. The next prime is 87480227. The reversal of 87480221 is 12208478.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84456100 + 3024121 = 9190^2 + 1739^2 .

It is a cyclic number.

It is not a de Polignac number, because 87480221 - 2¹⁸ = 87218077 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87480227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43740110 + 43740111.

It is an arithmetic number, because the mean of its divisors is an integer number (43740111).

Almost surely, 2^87480221 is an apocalyptic number.

It is an amenable number.

87480221 is a deficient number, since it is larger than the sum of its proper divisors (1).

87480221 is an equidigital number, since it uses as much as digits as its factorization.

87480221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 87480221 is about 9353.0861751617. The cubic root of 87480221 is about 443.9185472014.

Adding to 87480221 its reverse (12208478), we get a palindrome (99688699).

The spelling of 87480221 in words is "eighty-seven million, four hundred eighty thousand, two hundred twenty-one".