2066191 has 4 divisors (see below), whose sum is σ = 2122072. Its totient is φ = 2010312.

The previous prime is 2066179. The next prime is 2066201. The reversal of 2066191 is 1916602.

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 2066191 - 2¹¹ = 2064143 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2066101) 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, 27885 + ... + 27958.

It is an arithmetic number, because the mean of its divisors is an integer number (530518).

2^2066191 is an apocalyptic number.

2066191 is a deficient number, since it is larger than the sum of its proper divisors (55881).

2066191 is an equidigital number, since it uses as much as digits as its factorization.

2066191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55880.

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

The square root of 2066191 is about 1437.4251284850. The cubic root of 2066191 is about 127.3669713371.

The spelling of 2066191 in words is "two million, sixty-six thousand, one hundred ninety-one".