1312320143 has 4 divisors (see below), whose sum is σ = 1312598400. Its totient is φ = 1312041888.

The previous prime is 1312320137. The next prime is 1312320167. The reversal of 1312320143 is 3410232131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3410232131 = 197 ⋅17310823.

It is a cyclic number.

It is not a de Polignac number, because 1312320143 - 2⁴ = 1312320127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312320133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131930 + ... + 141527.

It is an arithmetic number, because the mean of its divisors is an integer number (328149600).

Almost surely, 2^1312320143 is an apocalyptic number.

1312320143 is a deficient number, since it is larger than the sum of its proper divisors (278257).

1312320143 is an equidigital number, since it uses as much as digits as its factorization.

1312320143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278256.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1312320143 is about 36225.9595180031. The cubic root of 1312320143 is about 1094.8297708033.

Adding to 1312320143 its reverse (3410232131), we get a palindrome (4722552274).

The spelling of 1312320143 in words is "one billion, three hundred twelve million, three hundred twenty thousand, one hundred forty-three".