8701521 has 12 divisors (see below), whose sum is σ = 12130608. Its totient is φ = 5547784.

The previous prime is 8701519. The next prime is 8701529. The reversal of 8701521 is 1251078.

It is not a de Polignac number, because 8701521 - 2¹ = 8701519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8701491 and 8701500.

It is not an unprimeable number, because it can be changed into a prime (8701529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1155 + ... + 4328.

It is an arithmetic number, because the mean of its divisors is an integer number (1010884).

Almost surely, 2^8701521 is an apocalyptic number.

It is an amenable number.

8701521 is a deficient number, since it is larger than the sum of its proper divisors (3429087).

8701521 is a wasteful number, since it uses less digits than its factorization.

8701521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5532 (or 5509 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 24.

The square root of 8701521 is about 2949.8340631297. The cubic root of 8701521 is about 205.6829965777.

Adding to 8701521 its reverse (1251078), we get a palindrome (9952599).

The spelling of 8701521 in words is "eight million, seven hundred one thousand, five hundred twenty-one".