1311636644 has 12 divisors (see below), whose sum is σ = 2304510768. Its totient is φ = 653205000.

The previous prime is 1311636637. The next prime is 1311636707. The reversal of 1311636644 is 4466361131.

It is an unprimeable number.

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, 652202 + ... + 654209.

It is an arithmetic number, because the mean of its divisors is an integer number (192042564).

Almost surely, 2^1311636644 is an apocalyptic number.

It is an amenable number.

1311636644 is a deficient number, since it is larger than the sum of its proper divisors (992874124).

1311636644 is a wasteful number, since it uses less digits than its factorization.

1311636644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1306666 (or 1306664 counting only the distinct ones).

The product of its digits is 31104, while the sum is 35.

The square root of 1311636644 is about 36216.5244605277. The cubic root of 1311636644 is about 1094.6396634806.

Adding to 1311636644 its reverse (4466361131), we get a palindrome (5777997775).

The spelling of 1311636644 in words is "one billion, three hundred eleven million, six hundred thirty-six thousand, six hundred forty-four".