2169891 has 12 divisors (see below), whose sum is σ = 3147768. Its totient is φ = 1440384.

The previous prime is 2169883. The next prime is 2169913. The reversal of 2169891 is 1989612.

It is not a de Polignac number, because 2169891 - 2³ = 2169883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2169821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2836 + ... + 3518.

It is an arithmetic number, because the mean of its divisors is an integer number (262314).

2^2169891 is an apocalyptic number.

2169891 is a deficient number, since it is larger than the sum of its proper divisors (977877).

2169891 is a wasteful number, since it uses less digits than its factorization.

2169891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042 (or 1039 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 2169891 is about 1473.0549887903. The cubic root of 2169891 is about 129.4630913039.

The spelling of 2169891 in words is "two million, one hundred sixty-nine thousand, eight hundred ninety-one".