1568280013 has 4 divisors (see below), whose sum is σ = 1570248540. Its totient is φ = 1566311488.

The previous prime is 1568279989. The next prime is 1568280019. The reversal of 1568280013 is 3100828651.

1568280013 = 28002² + 28003².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3100828651 = 23 ⋅134818637.

It can be written as a sum of positive squares in 2 ways, for example, as 784168009 + 784112004 = 28003^2 + 28002^2 .

It is a cyclic number.

It is not a de Polignac number, because 1568280013 - 2¹³ = 1568271821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1568280019) 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, 983068 + ... + 984661.

It is an arithmetic number, because the mean of its divisors is an integer number (392562135).

Almost surely, 2^1568280013 is an apocalyptic number.

1568280013 is the 28003-rd centered square number.

It is an amenable number.

1568280013 is a deficient number, since it is larger than the sum of its proper divisors (1968527).

1568280013 is an equidigital number, since it uses as much as digits as its factorization.

1568280013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968526.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 1568280013 is about 39601.5152866655. The cubic root of 1568280013 is about 1161.8262980183.

The spelling of 1568280013 in words is "one billion, five hundred sixty-eight million, two hundred eighty thousand, thirteen".