123000191 has 4 divisors (see below), whose sum is σ = 125085000. Its totient is φ = 120915384.

The previous prime is 123000169. The next prime is 123000193. The reversal of 123000191 is 191000321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191000321 = 17 ⋅11235313.

It is a cyclic number.

It is not a de Polignac number, because 123000191 - 2²⁶ = 55891327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123000193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1042316 + ... + 1042433.

It is an arithmetic number, because the mean of its divisors is an integer number (31271250).

Almost surely, 2^123000191 is an apocalyptic number.

123000191 is a deficient number, since it is larger than the sum of its proper divisors (2084809).

123000191 is an equidigital number, since it uses as much as digits as its factorization.

123000191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2084808.

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

The square root of 123000191 is about 11090.5451173511. The cubic root of 123000191 is about 497.3192407466.

The spelling of 123000191 in words is "one hundred twenty-three million, one hundred ninety-one", and thus it is an aban number.