1243542143 has 2 divisors, whose sum is σ = 1243542144. Its totient is φ = 1243542142.

The previous prime is 1243542133. The next prime is 1243542151. The reversal of 1243542143 is 3412453421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1243542143 - 2¹⁰ = 1243541119 is a prime.

It is a super-2 number, since 2×1243542143² = 3092794122834064898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243542133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621771071 + 621771072.

It is an arithmetic number, because the mean of its divisors is an integer number (621771072).

Almost surely, 2^1243542143 is an apocalyptic number.

1243542143 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243542143 is an equidigital number, since it uses as much as digits as its factorization.

1243542143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 29.

The square root of 1243542143 is about 35263.8929076187. The cubic root of 1243542143 is about 1075.3590703874.

Adding to 1243542143 its reverse (3412453421), we get a palindrome (4655995564).

The spelling of 1243542143 in words is "one billion, two hundred forty-three million, five hundred forty-two thousand, one hundred forty-three".