8042521 has 2 divisors, whose sum is σ = 8042522. Its totient is φ = 8042520.

The previous prime is 8042509. The next prime is 8042533. The reversal of 8042521 is 1252408.

It is a balanced prime because it is at equal distance from previous prime (8042509) and next prime (8042533).

It can be written as a sum of positive squares in only one way, i.e., 6051600 + 1990921 = 2460^2 + 1411^2 .

It is a cyclic number.

It is not a de Polignac number, because 8042521 - 2⁷ = 8042393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8042492 and 8042501.

It is not a weakly prime, because it can be changed into another prime (8042621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4021260 + 4021261.

It is an arithmetic number, because the mean of its divisors is an integer number (4021261).

Almost surely, 2^8042521 is an apocalyptic number.

It is an amenable number.

8042521 is a deficient number, since it is larger than the sum of its proper divisors (1).

8042521 is an equidigital number, since it uses as much as digits as its factorization.

8042521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 8042521 is about 2835.9338849839. The cubic root of 8042521 is about 200.3537157238.

Adding to 8042521 its reverse (1252408), we get a palindrome (9294929).

The spelling of 8042521 in words is "eight million, forty-two thousand, five hundred twenty-one".