8187521 has 2 divisors, whose sum is σ = 8187522. Its totient is φ = 8187520.

The previous prime is 8187511. The next prime is 8187527. The reversal of 8187521 is 1257818.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8179600 + 7921 = 2860^2 + 89^2 .

It is a cyclic number.

It is not a de Polignac number, because 8187521 - 2¹⁸ = 7925377 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8187527) 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 as a sum of consecutive naturals, namely, 4093760 + 4093761.

It is an arithmetic number, because the mean of its divisors is an integer number (4093761).

Almost surely, 2^8187521 is an apocalyptic number.

It is an amenable number.

8187521 is a deficient number, since it is larger than the sum of its proper divisors (1).

8187521 is an equidigital number, since it uses as much as digits as its factorization.

8187521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4480, while the sum is 32.

The square root of 8187521 is about 2861.3844551196. The cubic root of 8187521 is about 201.5506217907.

The spelling of 8187521 in words is "eight million, one hundred eighty-seven thousand, five hundred twenty-one".