1020605563 has 2 divisors, whose sum is σ = 1020605564. Its totient is φ = 1020605562.

The previous prime is 1020605561. The next prime is 1020605587. The reversal of 1020605563 is 3655060201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1020605563 - 2¹ = 1020605561 is a prime.

Together with 1020605561, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1020605561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510302781 + 510302782.

It is an arithmetic number, because the mean of its divisors is an integer number (510302782).

Almost surely, 2^1020605563 is an apocalyptic number.

1020605563 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020605563 is an equidigital number, since it uses as much as digits as its factorization.

1020605563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 1020605563 is about 31946.9178951585. The cubic root of 1020605563 is about 1006.8218771664.

Adding to 1020605563 its reverse (3655060201), we get a palindrome (4675665764).

The spelling of 1020605563 in words is "one billion, twenty million, six hundred five thousand, five hundred sixty-three".