2123191 has 4 divisors (see below), whose sum is σ = 2426512. Its totient is φ = 1819872.

The previous prime is 2123167. The next prime is 2123203. The reversal of 2123191 is 1913212.

2123191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2123191 - 2⁷ = 2123063 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 (2123141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151650 + ... + 151663.

It is an arithmetic number, because the mean of its divisors is an integer number (606628).

2^2123191 is an apocalyptic number.

2123191 is a deficient number, since it is larger than the sum of its proper divisors (303321).

2123191 is an equidigital number, since it uses as much as digits as its factorization.

2123191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303320.

The product of its digits is 108, while the sum is 19.

The square root of 2123191 is about 1457.1173597209. The cubic root of 2123191 is about 128.5275872275.

It can be divided in two parts, 212 and 3191, that added together give a triangular number (3403 = T₈₂).

The spelling of 2123191 in words is "two million, one hundred twenty-three thousand, one hundred ninety-one".