28521523 has 2 divisors, whose sum is σ = 28521524. Its totient is φ = 28521522.

The previous prime is 28521517. The next prime is 28521547. The reversal of 28521523 is 32512582.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28521523 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28521491 and 28521500.

It is not a weakly prime, because it can be changed into another prime (28521553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14260761 + 14260762.

It is an arithmetic number, because the mean of its divisors is an integer number (14260762).

Almost surely, 2^28521523 is an apocalyptic number.

28521523 is a deficient number, since it is larger than the sum of its proper divisors (1).

28521523 is an equidigital number, since it uses as much as digits as its factorization.

28521523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800, while the sum is 28.

The square root of 28521523 is about 5340.5545592195. The cubic root of 28521523 is about 305.5326105427.

The spelling of 28521523 in words is "twenty-eight million, five hundred twenty-one thousand, five hundred twenty-three".