2168091 has 6 divisors (see below), whose sum is σ = 3131700. Its totient is φ = 1445388.

The previous prime is 2168081. The next prime is 2168093. The reversal of 2168091 is 1908612.

It is not a de Polignac number, because 2168091 - 2⁵ = 2168059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2168093) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 120441 + ... + 120458.

It is an arithmetic number, because the mean of its divisors is an integer number (521950).

2^2168091 is an apocalyptic number.

2168091 is a deficient number, since it is larger than the sum of its proper divisors (963609).

2168091 is a wasteful number, since it uses less digits than its factorization.

2168091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240905 (or 240902 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 2168091 is about 1472.4438868765. The cubic root of 2168091 is about 129.4272833561.

The spelling of 2168091 in words is "two million, one hundred sixty-eight thousand, ninety-one".