1568397609 has 27 divisors (see below), whose sum is σ = 2326953213. Its totient is φ = 1017955512.

The previous prime is 1568397599. The next prime is 1568397613. The reversal of 1568397609 is 9067938651.

The square root of 1568397609 is 39603.

It is a perfect power (a square), and thus also a powerful number.

1568397609 is a `hidden beast` number, since 1 + 568 + 3 + 9 + 76 + 0 + 9 = 666.

It is not a de Polignac number, because 1568397609 - 2¹¹ = 1568395561 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1568397619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 5108634 + ... + 5108940.

Almost surely, 2^1568397609 is an apocalyptic number.

1568397609 is the 39603-rd square number.

1568397609 is the 19802-nd centered octagonal number.

It is an amenable number.

1568397609 is a deficient number, since it is larger than the sum of its proper divisors (758555604).

1568397609 is an frugal number, since it uses more digits than its factorization.

1568397609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706 (or 353 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The cubic root of 1568397609 is about 1161.8553367762.

The spelling of 1568397609 in words is "one billion, five hundred sixty-eight million, three hundred ninety-seven thousand, six hundred nine".