1242116123 has 2 divisors, whose sum is σ = 1242116124. Its totient is φ = 1242116122.

The previous prime is 1242116119. The next prime is 1242116143. The reversal of 1242116123 is 3216112421.

It is a weak prime.

It is an emirp because it is prime and its reverse (3216112421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1242116123 - 2² = 1242116119 is a prime.

It is a super-2 number, since 2×1242116123² = 3085704926033102258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1242116143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621058061 + 621058062.

It is an arithmetic number, because the mean of its divisors is an integer number (621058062).

Almost surely, 2^1242116123 is an apocalyptic number.

1242116123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242116123 is an equidigital number, since it uses as much as digits as its factorization.

1242116123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 23.

The square root of 1242116123 is about 35243.6678426068. The cubic root of 1242116123 is about 1074.9478606044.

Adding to 1242116123 its reverse (3216112421), we get a palindrome (4458228544).

The spelling of 1242116123 in words is "one billion, two hundred forty-two million, one hundred sixteen thousand, one hundred twenty-three".