2660191 has 4 divisors (see below), whose sum is σ = 2663584. Its totient is φ = 2656800.

The previous prime is 2660183. The next prime is 2660219. The reversal of 2660191 is 1910662.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2660191 - 2³ = 2660183 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 (2660131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151 + ... + 2311.

It is an arithmetic number, because the mean of its divisors is an integer number (665896).

2^2660191 is an apocalyptic number.

2660191 is a deficient number, since it is larger than the sum of its proper divisors (3393).

2660191 is a wasteful number, since it uses less digits than its factorization.

2660191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3392.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 2660191 is about 1631.0091967858. The cubic root of 2660191 is about 138.5599144738.

The spelling of 2660191 in words is "two million, six hundred sixty thousand, one hundred ninety-one".