8713521 has 16 divisors (see below), whose sum is σ = 12987520. Its totient is φ = 5773680.

The previous prime is 8713519. The next prime is 8713531. The reversal of 8713521 is 1253178.

It is not a de Polignac number, because 8713521 - 2¹ = 8713519 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8713531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3996 + ... + 5778.

It is an arithmetic number, because the mean of its divisors is an integer number (811720).

Almost surely, 2^8713521 is an apocalyptic number.

It is an amenable number.

8713521 is a deficient number, since it is larger than the sum of its proper divisors (4273999).

8713521 is a wasteful number, since it uses less digits than its factorization.

8713521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1973 (or 1967 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 8713521 is about 2951.8673750696. The cubic root of 8713521 is about 205.7775035121. Note that the first 3 decimals are identical.

Adding to 8713521 its reverse (1253178), we get a palindrome (9966699).

The spelling of 8713521 in words is "eight million, seven hundred thirteen thousand, five hundred twenty-one".