8547521 has 2 divisors, whose sum is σ = 8547522. Its totient is φ = 8547520.

The previous prime is 8547509. The next prime is 8547523. The reversal of 8547521 is 1257458.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5013121 + 3534400 = 2239^2 + 1880^2 .

It is a cyclic number.

It is not a de Polignac number, because 8547521 - 2¹⁰ = 8546497 is a prime.

Together with 8547523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8547523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4273760 + 4273761.

It is an arithmetic number, because the mean of its divisors is an integer number (4273761).

Almost surely, 2^8547521 is an apocalyptic number.

It is an amenable number.

8547521 is a deficient number, since it is larger than the sum of its proper divisors (1).

8547521 is an equidigital number, since it uses as much as digits as its factorization.

8547521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11200, while the sum is 32.

The square root of 8547521 is about 2923.6143726559. The cubic root of 8547521 is about 204.4623707523.

The spelling of 8547521 in words is "eight million, five hundred forty-seven thousand, five hundred twenty-one".