203123434243 has 2 divisors, whose sum is σ = 203123434244. Its totient is φ = 203123434242.

The previous prime is 203123434201. The next prime is 203123434247. The reversal of 203123434243 is 342434321302.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 203123434243 - 2¹⁷ = 203123303171 is a prime.

It is not a weakly prime, because it can be changed into another prime (203123434247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101561717121 + 101561717122.

It is an arithmetic number, because the mean of its divisors is an integer number (101561717122).

Almost surely, 2^203123434243 is an apocalyptic number.

203123434243 is a deficient number, since it is larger than the sum of its proper divisors (1).

203123434243 is an equidigital number, since it uses as much as digits as its factorization.

203123434243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 31.

Adding to 203123434243 its reverse (342434321302), we get a palindrome (545557755545).

The spelling of 203123434243 in words is "two hundred three billion, one hundred twenty-three million, four hundred thirty-four thousand, two hundred forty-three".