123191 has 2 divisors, whose sum is σ = 123192. Its totient is φ = 123190.

The previous prime is 123169. The next prime is 123203. The reversal of 123191 is 191321.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123191 - 2⁶ = 123127 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61595 + 61596.

It is an arithmetic number, because the mean of its divisors is an integer number (61596).

2¹²³¹⁹¹ is an apocalyptic number.

123191 is a deficient number, since it is larger than the sum of its proper divisors (1).

123191 is an equidigital number, since it uses as much as digits as its factorization.

123191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54, while the sum is 17.

The square root of 123191 is about 350.9857546967. The cubic root of 123191 is about 49.7576270050.

The spelling of 123191 in words is "one hundred twenty-three thousand, one hundred ninety-one".