203123142191 has 2 divisors, whose sum is σ = 203123142192. Its totient is φ = 203123142190.

The previous prime is 203123142169. The next prime is 203123142199. The reversal of 203123142191 is 191241321302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203123142191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203123142199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101561571095 + 101561571096.

It is an arithmetic number, because the mean of its divisors is an integer number (101561571096).

Almost surely, 2^203123142191 is an apocalyptic number.

203123142191 is a deficient number, since it is larger than the sum of its proper divisors (1).

203123142191 is an equidigital number, since it uses as much as digits as its factorization.

203123142191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

Adding to 203123142191 its reverse (191241321302), we get a palindrome (394364463493).

The spelling of 203123142191 in words is "two hundred three billion, one hundred twenty-three million, one hundred forty-two thousand, one hundred ninety-one".