2009091 has 16 divisors (see below), whose sum is σ = 3168000. Its totient is φ = 1108128.

The previous prime is 2009083. The next prime is 2009093. The reversal of 2009091 is 1909002.

It is a happy number.

It is not a de Polignac number, because 2009091 - 2³ = 2009083 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

2009091 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2009093) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1041 + ... + 2258.

It is an arithmetic number, because the mean of its divisors is an integer number (198000).

2^2009091 is an apocalyptic number.

2009091 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2009091 is a deficient number, since it is larger than the sum of its proper divisors (1158909).

2009091 is a wasteful number, since it uses less digits than its factorization.

2009091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3338.

The product of its (nonzero) digits is 162, while the sum is 21.

The square root of 2009091 is about 1417.4240720405. The cubic root of 2009091 is about 126.1827155116.

The spelling of 2009091 in words is "two million, nine thousand, ninety-one".