123290191 has 2 divisors, whose sum is σ = 123290192. Its totient is φ = 123290190.

The previous prime is 123290177. The next prime is 123290197. The reversal of 123290191 is 191092321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123290191 - 2⁹ = 123289679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123290197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61645095 + 61645096.

It is an arithmetic number, because the mean of its divisors is an integer number (61645096).

Almost surely, 2^123290191 is an apocalyptic number.

123290191 is a deficient number, since it is larger than the sum of its proper divisors (1).

123290191 is an equidigital number, since it uses as much as digits as its factorization.

123290191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 123290191 is about 11103.6116196488. The cubic root of 123290191 is about 497.7097804723.

The spelling of 123290191 in words is "one hundred twenty-three million, two hundred ninety thousand, one hundred ninety-one".