123102191 has 4 divisors (see below), whose sum is σ = 123127512. Its totient is φ = 123076872.

The previous prime is 123102181. The next prime is 123102193. The reversal of 123102191 is 191201321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191201321 = 29 ⋅6593149.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123102191 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 (123102193) 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, 2816 + ... + 15941.

It is an arithmetic number, because the mean of its divisors is an integer number (30781878).

Almost surely, 2^123102191 is an apocalyptic number.

123102191 is a deficient number, since it is larger than the sum of its proper divisors (25321).

123102191 is an equidigital number, since it uses as much as digits as its factorization.

123102191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25320.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 123102191 is about 11095.1426759641. The cubic root of 123102191 is about 497.4566729100.

The spelling of 123102191 in words is "one hundred twenty-three million, one hundred two thousand, one hundred ninety-one".