1563320113 has 4 divisors (see below), whose sum is σ = 1565752048. Its totient is φ = 1560888180.

The previous prime is 1563320047. The next prime is 1563320137. The reversal of 1563320113 is 3110233651.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1563320113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1563320413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1215003 + ... + 1216288.

It is an arithmetic number, because the mean of its divisors is an integer number (391438012).

Almost surely, 2^1563320113 is an apocalyptic number.

It is an amenable number.

1563320113 is a deficient number, since it is larger than the sum of its proper divisors (2431935).

1563320113 is an equidigital number, since it uses as much as digits as its factorization.

1563320113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2431934.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 1563320113 is about 39538.8430913197. The cubic root of 1563320113 is about 1160.6001930186.

Adding to 1563320113 its reverse (3110233651), we get a palindrome (4673553764).

The spelling of 1563320113 in words is "one billion, five hundred sixty-three million, three hundred twenty thousand, one hundred thirteen".