1312340443 has 2 divisors, whose sum is σ = 1312340444. Its totient is φ = 1312340442.

The previous prime is 1312340401. The next prime is 1312340461. The reversal of 1312340443 is 3440432131.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1312340443 is a prime.

It is not a weakly prime, because it can be changed into another prime (1312340543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656170221 + 656170222.

It is an arithmetic number, because the mean of its divisors is an integer number (656170222).

Almost surely, 2^1312340443 is an apocalyptic number.

1312340443 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312340443 is an equidigital number, since it uses as much as digits as its factorization.

1312340443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 1312340443 is about 36226.2397027348. The cubic root of 1312340443 is about 1094.8354160035.

Adding to 1312340443 its reverse (3440432131), we get a palindrome (4752772574).

It can be divided in two parts, 1312 and 340443, that multiplied together give a triangular number (446661216 = T₂₉₈₈₈).

The spelling of 1312340443 in words is "one billion, three hundred twelve million, three hundred forty thousand, four hundred forty-three".