123231191 has 2 divisors, whose sum is σ = 123231192. Its totient is φ = 123231190.

The previous prime is 123231167. The next prime is 123231203. The reversal of 123231191 is 191132321.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123231191 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123231161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61615595 + 61615596.

It is an arithmetic number, because the mean of its divisors is an integer number (61615596).

Almost surely, 2^123231191 is an apocalyptic number.

123231191 is a deficient number, since it is larger than the sum of its proper divisors (1).

123231191 is an equidigital number, since it uses as much as digits as its factorization.

123231191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 23.

The square root of 123231191 is about 11100.9545085096. The cubic root of 123231191 is about 497.6303755004.

It can be divided in two parts, 1232 and 31191, that added together give a palindrome (32423).

The spelling of 123231191 in words is "one hundred twenty-three million, two hundred thirty-one thousand, one hundred ninety-one".