1220501563 has 2 divisors, whose sum is σ = 1220501564. Its totient is φ = 1220501562.

The previous prime is 1220501549. The next prime is 1220501591. The reversal of 1220501563 is 3651050221.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220501563 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220501533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610250781 + 610250782.

It is an arithmetic number, because the mean of its divisors is an integer number (610250782).

Almost surely, 2^1220501563 is an apocalyptic number.

1220501563 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220501563 is an equidigital number, since it uses as much as digits as its factorization.

1220501563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 1220501563 is about 34935.6775088161. The cubic root of 1220501563 is about 1068.6761404084.

Adding to 1220501563 its reverse (3651050221), we get a palindrome (4871551784).

The spelling of 1220501563 in words is "one billion, two hundred twenty million, five hundred one thousand, five hundred sixty-three".