500021563 has 2 divisors, whose sum is σ = 500021564. Its totient is φ = 500021562.

The previous prime is 500021507. The next prime is 500021581. The reversal of 500021563 is 365120005.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-500021563 is a prime.

It is not a weakly prime, because it can be changed into another prime (500091563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250010781 + 250010782.

It is an arithmetic number, because the mean of its divisors is an integer number (250010782).

Almost surely, 2^500021563 is an apocalyptic number.

500021563 is a deficient number, since it is larger than the sum of its proper divisors (1).

500021563 is an equidigital number, since it uses as much as digits as its factorization.

500021563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 500021563 is about 22361.1619331376. The cubic root of 500021563 is about 793.7119355297.

Adding to 500021563 its reverse (365120005), we get a palindrome (865141568).

The spelling of 500021563 in words is "five hundred million, twenty-one thousand, five hundred sixty-three".