505042123 has 2 divisors, whose sum is σ = 505042124. Its totient is φ = 505042122.

The previous prime is 505042121. The next prime is 505042129. The reversal of 505042123 is 321240505.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 505042123 - 2¹ = 505042121 is a prime.

Together with 505042121, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 505042094 and 505042103.

It is not a weakly prime, because it can be changed into another prime (505042121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252521061 + 252521062.

It is an arithmetic number, because the mean of its divisors is an integer number (252521062).

Almost surely, 2^505042123 is an apocalyptic number.

505042123 is a deficient number, since it is larger than the sum of its proper divisors (1).

505042123 is an equidigital number, since it uses as much as digits as its factorization.

505042123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 505042123 is about 22473.1422591501. The cubic root of 505042123 is about 796.3595648975.

Adding to 505042123 its reverse (321240505), we get a palindrome (826282628).

The spelling of 505042123 in words is "five hundred five million, forty-two thousand, one hundred twenty-three".