203042123 has 2 divisors, whose sum is σ = 203042124. Its totient is φ = 203042122.

The previous prime is 203042117. The next prime is 203042131. The reversal of 203042123 is 321240302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 203042123 - 2¹⁰ = 203041099 is a prime.

It is a super-2 number, since 2×203042123² = 82452207424694258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (253042123) 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, 101521061 + 101521062.

It is an arithmetic number, because the mean of its divisors is an integer number (101521062).

Almost surely, 2^203042123 is an apocalyptic number.

203042123 is a deficient number, since it is larger than the sum of its proper divisors (1).

203042123 is an equidigital number, since it uses as much as digits as its factorization.

203042123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 203042123 is about 14249.2849996061. The cubic root of 203042123 is about 587.7537137459.

Adding to 203042123 its reverse (321240302), we get a palindrome (524282425).

The spelling of 203042123 in words is "two hundred three million, forty-two thousand, one hundred twenty-three".