1568113321 has 4 divisors (see below), whose sum is σ = 1568772100. Its totient is φ = 1567454544.

The previous prime is 1568113291. The next prime is 1568113357. The reversal of 1568113321 is 1233118651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1233118651 = 31 ⋅39778021.

It can be written as a sum of positive squares in 2 ways, for example, as 1128624025 + 439489296 = 33595^2 + 20964^2 .

It is a cyclic number.

It is not a de Polignac number, because 1568113321 - 2⁵ = 1568113289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1568113381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325806 + ... + 330583.

It is an arithmetic number, because the mean of its divisors is an integer number (392193025).

Almost surely, 2^1568113321 is an apocalyptic number.

It is an amenable number.

1568113321 is a deficient number, since it is larger than the sum of its proper divisors (658779).

1568113321 is an equidigital number, since it uses as much as digits as its factorization.

1568113321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658778.

The product of its digits is 4320, while the sum is 31.

The square root of 1568113321 is about 39599.4106143008. The cubic root of 1568113321 is about 1161.7851331732.

The spelling of 1568113321 in words is "one billion, five hundred sixty-eight million, one hundred thirteen thousand, three hundred twenty-one".