8221487 has 2 divisors, whose sum is σ = 8221488. Its totient is φ = 8221486.

The previous prime is 8221469. The next prime is 8221513. The reversal of 8221487 is 7841228.

8221487 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8221487 - 2¹⁴ = 8205103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8221427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4110743 + 4110744.

It is an arithmetic number, because the mean of its divisors is an integer number (4110744).

Almost surely, 2^8221487 is an apocalyptic number.

8221487 is a deficient number, since it is larger than the sum of its proper divisors (1).

8221487 is an equidigital number, since it uses as much as digits as its factorization.

8221487 is an evil number, because the sum of its binary digits is even.

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

The square root of 8221487 is about 2867.3135510439. The cubic root of 8221487 is about 201.8289487496.

The spelling of 8221487 in words is "eight million, two hundred twenty-one thousand, four hundred eighty-seven".