521942563 has 2 divisors, whose sum is σ = 521942564. Its totient is φ = 521942562.

The previous prime is 521942549. The next prime is 521942581. The reversal of 521942563 is 365249125.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521942563 - 2⁹ = 521942051 is a prime.

It is not a weakly prime, because it can be changed into another prime (521942543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260971281 + 260971282.

It is an arithmetic number, because the mean of its divisors is an integer number (260971282).

Almost surely, 2^521942563 is an apocalyptic number.

521942563 is a deficient number, since it is larger than the sum of its proper divisors (1).

521942563 is an equidigital number, since it uses as much as digits as its factorization.

521942563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 37.

The square root of 521942563 is about 22846.0623084154. The cubic root of 521942563 is about 805.1452552204.

The spelling of 521942563 in words is "five hundred twenty-one million, nine hundred forty-two thousand, five hundred sixty-three".