56444731561 has 3 divisors (see below), whose sum is σ = 56444969143. Its totient is φ = 56444493980.

The previous prime is 56444731523. The next prime is 56444731579. The reversal of 56444731561 is 16513744465.

It is a happy number.

The square root of 56444731561 is 237581.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 209351961 + 56235379600 = 14469^2 + 237140^2 .

It is not a de Polignac number, because 56444731561 - 2¹⁹ = 56444207273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56444731501) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 118791 + ... + 356371.

Almost surely, 2^56444731561 is an apocalyptic number.

56444731561 is the 237581-st square number.

56444731561 is the 118791-st centered octagonal number.

It is an amenable number.

56444731561 is a deficient number, since it is larger than the sum of its proper divisors (237582).

56444731561 is an frugal number, since it uses more digits than its factorization.

56444731561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475162 (or 237581 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 46.

The spelling of 56444731561 in words is "fifty-six billion, four hundred forty-four million, seven hundred thirty-one thousand, five hundred sixty-one".