521520523 has 2 divisors, whose sum is σ = 521520524. Its totient is φ = 521520522.

The previous prime is 521520497. The next prime is 521520539. The reversal of 521520523 is 325025125.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 521520523 - 2⁵ = 521520491 is a prime.

It is not a weakly prime, because it can be changed into another prime (521520023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260760261 + 260760262.

It is an arithmetic number, because the mean of its divisors is an integer number (260760262).

Almost surely, 2^521520523 is an apocalyptic number.

521520523 is a deficient number, since it is larger than the sum of its proper divisors (1).

521520523 is an equidigital number, since it uses as much as digits as its factorization.

521520523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 521520523 is about 22836.8238378282. The cubic root of 521520523 is about 804.9281846354.

Adding to 521520523 its reverse (325025125), we get a palindrome (846545648).

The spelling of 521520523 in words is "five hundred twenty-one million, five hundred twenty thousand, five hundred twenty-three".