2163091 has 4 divisors (see below), whose sum is σ = 2472112. Its totient is φ = 1854072.

The previous prime is 2163079. The next prime is 2163101. The reversal of 2163091 is 1903612.

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 2163091 - 2⁵ = 2163059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2163011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154500 + ... + 154513.

It is an arithmetic number, because the mean of its divisors is an integer number (618028).

2^2163091 is an apocalyptic number.

2163091 is a deficient number, since it is larger than the sum of its proper divisors (309021).

2163091 is an equidigital number, since it uses as much as digits as its factorization.

2163091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309020.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 2163091 is about 1470.7450492862. The cubic root of 2163091 is about 129.3277127315.

The spelling of 2163091 in words is "two million, one hundred sixty-three thousand, ninety-one".