8700521 has 2 divisors, whose sum is σ = 8700522. Its totient is φ = 8700520.

The previous prime is 8700511. The next prime is 8700529. The reversal of 8700521 is 1250078.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8410000 + 290521 = 2900^2 + 539^2 .

It is a cyclic number.

It is not a de Polignac number, because 8700521 - 2⁶ = 8700457 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8700529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4350260 + 4350261.

It is an arithmetic number, because the mean of its divisors is an integer number (4350261).

Almost surely, 2^8700521 is an apocalyptic number.

It is an amenable number.

8700521 is a deficient number, since it is larger than the sum of its proper divisors (1).

8700521 is an equidigital number, since it uses as much as digits as its factorization.

8700521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 8700521 is about 2949.6645571997. The cubic root of 8700521 is about 205.6751170788.

Adding to 8700521 its reverse (1250078), we get a palindrome (9950599).

The spelling of 8700521 in words is "eight million, seven hundred thousand, five hundred twenty-one".