521240563 has 2 divisors, whose sum is σ = 521240564. Its totient is φ = 521240562.

The previous prime is 521240543. The next prime is 521240593. The reversal of 521240563 is 365042125.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521240563 - 2⁹ = 521240051 is a prime.

It is not a weakly prime, because it can be changed into another prime (521240543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260620281 + 260620282.

It is an arithmetic number, because the mean of its divisors is an integer number (260620282).

Almost surely, 2^521240563 is an apocalyptic number.

521240563 is a deficient number, since it is larger than the sum of its proper divisors (1).

521240563 is an equidigital number, since it uses as much as digits as its factorization.

521240563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 521240563 is about 22830.6934410674. The cubic root of 521240563 is about 804.7841263674.

Adding to 521240563 its reverse (365042125), we get a palindrome (886282688).

The spelling of 521240563 in words is "five hundred twenty-one million, two hundred forty thousand, five hundred sixty-three".