203143505123 has 16 divisors (see below), whose sum is σ = 223917673056. Its totient is φ = 183107070720.

The previous prime is 203143505087. The next prime is 203143505141. The reversal of 203143505123 is 321505341302.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 203143505123 - 2¹² = 203143501027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203143505023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2122661 + ... + 2216297.

It is an arithmetic number, because the mean of its divisors is an integer number (13994854566).

Almost surely, 2^203143505123 is an apocalyptic number.

203143505123 is a deficient number, since it is larger than the sum of its proper divisors (20774167933).

203143505123 is a wasteful number, since it uses less digits than its factorization.

203143505123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97574.

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 203143505123 its reverse (321505341302), we get a palindrome (524648846425).

The spelling of 203143505123 in words is "two hundred three billion, one hundred forty-three million, five hundred five thousand, one hundred twenty-three".