1311243044 has 12 divisors (see below), whose sum is σ = 2299187100. Its totient is φ = 654332448.

The previous prime is 1311243023. The next prime is 1311243049. The reversal of 1311243044 is 4403421131.

It can be written as a sum of positive squares in 2 ways, for example, as 1173884644 + 137358400 = 34262^2 + 11720^2 .

It is not an unprimeable number, because it can be changed into a prime (1311243049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319979 + ... + 324050.

It is an arithmetic number, because the mean of its divisors is an integer number (191598925).

Almost surely, 2^1311243044 is an apocalyptic number.

It is an amenable number.

1311243044 is a deficient number, since it is larger than the sum of its proper divisors (987944056).

1311243044 is a wasteful number, since it uses less digits than its factorization.

1311243044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644542 (or 644540 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 1311243044 is about 36211.0900692039. The cubic root of 1311243044 is about 1094.5301582357.

Adding to 1311243044 its reverse (4403421131), we get a palindrome (5714664175).

The spelling of 1311243044 in words is "one billion, three hundred eleven million, two hundred forty-three thousand, forty-four".