1242123143 has 2 divisors, whose sum is σ = 1242123144. Its totient is φ = 1242123142.

The previous prime is 1242123109. The next prime is 1242123163. The reversal of 1242123143 is 3413212421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1242123143 - 2⁶ = 1242123079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242123163) 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 as a sum of consecutive naturals, namely, 621061571 + 621061572.

It is an arithmetic number, because the mean of its divisors is an integer number (621061572).

Almost surely, 2^1242123143 is an apocalyptic number.

1242123143 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242123143 is an equidigital number, since it uses as much as digits as its factorization.

1242123143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 23.

The square root of 1242123143 is about 35243.7674348246. The cubic root of 1242123143 is about 1074.9498856753.

Adding to 1242123143 its reverse (3413212421), we get a palindrome (4655335564).

The spelling of 1242123143 in words is "one billion, two hundred forty-two million, one hundred twenty-three thousand, one hundred forty-three".