1321157143 has 2 divisors, whose sum is σ = 1321157144. Its totient is φ = 1321157142.

The previous prime is 1321157111. The next prime is 1321157177. The reversal of 1321157143 is 3417511231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321157143 - 2⁵ = 1321157111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321157183) by changing a digit.

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 as a sum of consecutive naturals, namely, 660578571 + 660578572.

It is an arithmetic number, because the mean of its divisors is an integer number (660578572).

Almost surely, 2^1321157143 is an apocalyptic number.

1321157143 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321157143 is an equidigital number, since it uses as much as digits as its factorization.

1321157143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 28.

The square root of 1321157143 is about 36347.7254171427. The cubic root of 1321157143 is about 1097.2817575499.

Adding to 1321157143 its reverse (3417511231), we get a palindrome (4738668374).

The spelling of 1321157143 in words is "one billion, three hundred twenty-one million, one hundred fifty-seven thousand, one hundred forty-three".