2019091 has 4 divisors (see below), whose sum is σ = 2039184. Its totient is φ = 1999000.

The previous prime is 2019089. The next prime is 2019113. The reversal of 2019091 is 1909102.

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 2019091 - 2¹ = 2019089 is a prime.

It is a Duffinian number.

2019091 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2019001) 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, 9895 + ... + 10096.

It is an arithmetic number, because the mean of its divisors is an integer number (509796).

2^2019091 is an apocalyptic number.

2019091 is a deficient number, since it is larger than the sum of its proper divisors (20093).

2019091 is a wasteful number, since it uses less digits than its factorization.

2019091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20092.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 2019091 is about 1420.9472192872. The cubic root of 2019091 is about 126.3917220384.

The spelling of 2019091 in words is "two million, nineteen thousand, ninety-one".