1561131344 has 10 divisors (see below), whose sum is σ = 3024692010. Its totient is φ = 780565664.

The previous prime is 1561131331. The next prime is 1561131349. The reversal of 1561131344 is 4431311651.

It can be written as a sum of positive squares in only one way, i.e., 1506371344 + 54760000 = 38812^2 + 7400^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561131349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48785339 + ... + 48785370.

It is an arithmetic number, because the mean of its divisors is an integer number (302469201).

Almost surely, 2^1561131344 is an apocalyptic number.

It is an amenable number.

1561131344 is a deficient number, since it is larger than the sum of its proper divisors (1463560666).

1561131344 is an equidigital number, since it uses as much as digits as its factorization.

1561131344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97570717 (or 97570711 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 1561131344 is about 39511.1546781412. The cubic root of 1561131344 is about 1160.0582967135.

Adding to 1561131344 its reverse (4431311651), we get a palindrome (5992442995).

The spelling of 1561131344 in words is "one billion, five hundred sixty-one million, one hundred thirty-one thousand, three hundred forty-four".