8523521 has 2 divisors, whose sum is σ = 8523522. Its totient is φ = 8523520.

The previous prime is 8523517. The next prime is 8523523. The reversal of 8523521 is 1253258.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6948496 + 1575025 = 2636^2 + 1255^2 .

It is a cyclic number.

It is not a de Polignac number, because 8523521 - 2² = 8523517 is a prime.

Together with 8523523, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₅₇₂₆₁₅ and since 8523521 and 572615 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (8523523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4261760 + 4261761.

It is an arithmetic number, because the mean of its divisors is an integer number (4261761).

Almost surely, 2^8523521 is an apocalyptic number.

It is an amenable number.

8523521 is a deficient number, since it is larger than the sum of its proper divisors (1).

8523521 is an equidigital number, since it uses as much as digits as its factorization.

8523521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 26.

The square root of 8523521 is about 2919.5069789264. The cubic root of 8523521 is about 204.2708260599.

Adding to 8523521 its reverse (1253258), we get a palindrome (9776779).

The spelling of 8523521 in words is "eight million, five hundred twenty-three thousand, five hundred twenty-one".