2087191 has 4 divisors (see below), whose sum is σ = 2090952. Its totient is φ = 2083432.

The previous prime is 2087179. The next prime is 2087203. The reversal of 2087191 is 1917802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1917802 = 2 ⋅958901.

It is an interprime number because it is at equal distance from previous prime (2087179) and next prime (2087203).

It is a cyclic number.

It is not a de Polignac number, because 2087191 - 2¹¹ = 2085143 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 (2087161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 865 + ... + 2218.

It is an arithmetic number, because the mean of its divisors is an integer number (522738).

2^2087191 is an apocalyptic number.

2087191 is a deficient number, since it is larger than the sum of its proper divisors (3761).

2087191 is an equidigital number, since it uses as much as digits as its factorization.

2087191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3760.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 2087191 is about 1444.7113898630. The cubic root of 2087191 is about 127.7970212284.

It can be divided in two parts, 2087 and 191, that added together give a triangular number (2278 = T₆₇).

The spelling of 2087191 in words is "two million, eighty-seven thousand, one hundred ninety-one".