1564811361 has 6 divisors (see below), whose sum is σ = 2260283090. Its totient is φ = 1043207568.

The previous prime is 1564811357. The next prime is 1564811389. The reversal of 1564811361 is 1631184651.

It is a happy number.

1564811361 is a `hidden beast` number, since 1 + 5 + 648 + 1 + 1 + 3 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1235171025 + 329640336 = 35145^2 + 18156^2 .

It is not a de Polignac number, because 1564811361 - 2² = 1564811357 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1564811321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 86933956 + ... + 86933973.

Almost surely, 2^1564811361 is an apocalyptic number.

It is an amenable number.

1564811361 is a deficient number, since it is larger than the sum of its proper divisors (695471729).

1564811361 is a wasteful number, since it uses less digits than its factorization.

1564811361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173867935 (or 173867932 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 1564811361 is about 39557.6966088775. The cubic root of 1564811361 is about 1160.9691071598.

The spelling of 1564811361 in words is "one billion, five hundred sixty-four million, eight hundred eleven thousand, three hundred sixty-one".