1312137644 has 12 divisors (see below), whose sum is σ = 2417095800. Its totient is φ = 621538848.

The previous prime is 1312137601. The next prime is 1312137661. The reversal of 1312137644 is 4467312131.

It is a self number, because there is not a number n which added to its sum of digits gives 1312137644.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8632409 + ... + 8632560.

It is an arithmetic number, because the mean of its divisors is an integer number (201424650).

Almost surely, 2^1312137644 is an apocalyptic number.

It is an amenable number.

1312137644 is a deficient number, since it is larger than the sum of its proper divisors (1104958156).

1312137644 is a wasteful number, since it uses less digits than its factorization.

1312137644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17264992 (or 17264990 counting only the distinct ones).

The product of its digits is 12096, while the sum is 32.

The square root of 1312137644 is about 36223.4405323404. The cubic root of 1312137644 is about 1094.7790172830.

Adding to 1312137644 its reverse (4467312131), we get a palindrome (5779449775).

The spelling of 1312137644 in words is "one billion, three hundred twelve million, one hundred thirty-seven thousand, six hundred forty-four".