1312047643 has 4 divisors (see below), whose sum is σ = 1312331328. Its totient is φ = 1311763960.

The previous prime is 1312047631. The next prime is 1312047707. The reversal of 1312047643 is 3467402131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3467402131 = 19 ⋅182494849.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1312047643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312047613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134788 + ... + 144193.

It is an arithmetic number, because the mean of its divisors is an integer number (328082832).

Almost surely, 2^1312047643 is an apocalyptic number.

1312047643 is a deficient number, since it is larger than the sum of its proper divisors (283685).

1312047643 is an equidigital number, since it uses as much as digits as its factorization.

1312047643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283684.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 1312047643 is about 36222.1982077289. The cubic root of 1312047643 is about 1094.7539860017.

Adding to 1312047643 its reverse (3467402131), we get a palindrome (4779449774).

The spelling of 1312047643 in words is "one billion, three hundred twelve million, forty-seven thousand, six hundred forty-three".