8432521 has 2 divisors, whose sum is σ = 8432522. Its totient is φ = 8432520.

The previous prime is 8432509. The next prime is 8432531. The reversal of 8432521 is 1252348.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5456896 + 2975625 = 2336^2 + 1725^2 .

It is a cyclic number.

It is not a de Polignac number, because 8432521 - 2¹¹ = 8430473 is a prime.

It is a super-2 number, since 2×8432521² = 142214820830882, which contains 22 as substring.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (8432531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4216260 + 4216261.

It is an arithmetic number, because the mean of its divisors is an integer number (4216261).

Almost surely, 2^8432521 is an apocalyptic number.

It is an amenable number.

8432521 is a deficient number, since it is larger than the sum of its proper divisors (1).

8432521 is an equidigital number, since it uses as much as digits as its factorization.

8432521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 25.

The square root of 8432521 is about 2903.8803350000. The cubic root of 8432521 is about 203.5412686680.

Adding to 8432521 its reverse (1252348), we get a palindrome (9684869).

It can be divided in two parts, 843 and 2521, that added together give a square (3364 = 58²).

The spelling of 8432521 in words is "eight million, four hundred thirty-two thousand, five hundred twenty-one".